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Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha

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Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 14 Jan 2018, 05:51
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Of 7,000 concert tickets, 80 tickets were not sold and of the ones that were sold, 50 percent were sold at 10 percent higher than the average price. If the average price of the sold tickets is $10 what is the total revenue?

A. 70,000
B. 69,200
C. 70,800
D. 69,120
E. 69,080
[Reveal] Spoiler: OA

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Re: Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 14 Jan 2018, 13:51
Bunuel wrote:
Of 7,000 concert tickets, 80 tickets were not sold and of the ones that were sold, 50 percent were sold at 10 percent higher than the average price. If the average price of the sold tickets is $10 what is the total revenue?

A. 70,000
B. 69,200
C. 70,800
D. 69,120
E. 69,080


As the calculation seems relatively straightforward, we'll just do it.
This is a Precise approach.

The total revenue is the average price of sold tickets * # of tickets sold.
This is $10 * (7000 - 80) = 69,200

(B) is our answer.
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Re: Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 14 Jan 2018, 14:12
DavidTutorexamPAL wrote:
Bunuel wrote:
Of 7,000 concert tickets, 80 tickets were not sold and of the ones that were sold, 50 percent were sold at 10 percent higher than the average price. If the average price of the sold tickets is $10 what is the total revenue?

A. 70,000
B. 69,200
C. 70,800
D. 69,120
E. 69,080


As the calculation seems relatively straightforward, we'll just do it.
This is a Precise approach.

The total revenue is the average price of sold tickets * # of tickets sold.
This is $10 * (7000 - 80) = 69,200

(B) is our answer.


Hi David,

How is the highlighted above reflected in your calculation?
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Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 14 Jan 2018, 14:23
Mo2men wrote:
DavidTutorexamPAL wrote:
Bunuel wrote:
Of 7,000 concert tickets, 80 tickets were not sold and of the ones that were sold, 50 percent were sold at 10 percent higher than the average price. If the average price of the sold tickets is $10 what is the total revenue?

A. 70,000
B. 69,200
C. 70,800
D. 69,120
E. 69,080


As the calculation seems relatively straightforward, we'll just do it.
This is a Precise approach.

The total revenue is the average price of sold tickets * # of tickets sold.
This is $10 * (7000 - 80) = 69,200

(B) is our answer.


Hi David,

How is the highlighted above reflected in your calculation?


Hi Mo2men,

It isn't.
I'm pretty sure this is a trick question... let's wait for the OA.

Breaking it down into 3 groups would be
1) 80 tickets at $0
2) 3460 tickets at average of all tickets +10%
3) 3460 tickets at who knows need to calculate
But since the average of 2) and 3) is $10, there is no need to calculate.

Note the word games between 'average price of sold tickets' and 'average price'.
TBH, took me a while to notice this. I assume this is what makes the question hard.
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Re: Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 14 Jan 2018, 14:46
DavidTutorexamPAL wrote:
Hi Mo2men,

It isn't.
I'm pretty sure this is a trick question... let's wait for the OA.

Breaking it down into 3 groups would be
1) 80 tickets at $0
2) 3460 tickets at average of all tickets +10%
3) 3460 tickets at who knows need to calculate
But since the average of 2) and 3) is $10, there is no need to calculate.

Note the word games between 'average price of sold tickets' and 'average price'.
TBH, took me a while to notice this. I assume this is what makes the question hard.



Can you elaborate more please your idea?
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Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 14 Jan 2018, 15:00
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Expert's post
Mo2men wrote:
DavidTutorexamPAL wrote:
Hi Mo2men,

It isn't.
I'm pretty sure this is a trick question... let's wait for the OA.

Breaking it down into 3 groups would be
1) 80 tickets at $0
2) 3460 tickets at average of all tickets +10%
3) 3460 tickets at who knows need to calculate
But since the average of 2) and 3) is $10, there is no need to calculate.

Note the word games between 'average price of sold tickets' and 'average price'.
TBH, took me a while to notice this. I assume this is what makes the question hard.



Can you elaborate more please your idea?



I'll try. Tell me if there is something specific you don't understand / agree with?

Usually, to calculate the revenue you'd divide the tickets into different price groups and multiply by the price per ticket in each group.
For example, if you had 5 tickets at $1 and 5 tickets at $2 then the revenue would be 1*5 + 2*5 = 15.

In this case, when you first read the question the instinct is to divide the tickets into 3 groups:
1) tickets that weren't sold. There are 80 of these and each generated $0 of revenue
2) 50% of the tickets that were sold. This is (7000 - 80)/2 = 3460 tickets. These were sold at "10% higher than the average price".
3) the other 50% of tickets that were sold - so another 3460 tickets. We have no information on the selling price of these tickets.

Creating an equation with the above 3 groups would give:
revenue = 80*0 + 3460*(average + 10%) + 3460*(unknown number)
Using this: "average price of the sold tickets is $10"
we can solve the above equation but it isn't fun.

Alternatively, we can divide all the tickets in the question into two groups:
1) this is the same as above - tickets that weren't sold. Each gives $0 of revenue.
2) all the tickets that were sold - a total of 6920 tickets. Each gives $10 on average of revenue.
So, our total revenue is 80*0 + 6920*10 = 69,200.

This is a trick question because the entire middle part of the prompt - "and of the ones that were sold, 50 percent were sold at 10 percent higher than the average price."
is useless and misleading. If the question were instead:
"Of 7,000 concert tickets, 80 tickets were not sold. If the average price of the sold tickets is $10 what is the total revenue?"
It would be much easier, wouldn't it?

Hope that helps!
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Re: Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 14 Jan 2018, 15:27
DavidTutorexamPAL wrote:
Mo2men wrote:
DavidTutorexamPAL wrote:
Hi Mo2men,

It isn't.
I'm pretty sure this is a trick question... let's wait for the OA.

Breaking it down into 3 groups would be
1) 80 tickets at $0
2) 3460 tickets at average of all tickets +10%
3) 3460 tickets at who knows need to calculate
But since the average of 2) and 3) is $10, there is no need to calculate.

Note the word games between 'average price of sold tickets' and 'average price'.
TBH, took me a while to notice this. I assume this is what makes the question hard.



Can you elaborate more please your idea?



I'll try. Tell me if there is something specific you don't understand / agree with?

Usually, to calculate the revenue you'd divide the tickets into different price groups and multiply by the price per ticket in each group.
For example, if you had 5 tickets at $1 and 5 tickets at $2 then the revenue would be 1*5 + 2*5 = 15.

In this case, when you first read the question the instinct is to divide the tickets into 3 groups:
1) tickets that weren't sold. There are 80 of these and each generated $0 of revenue
2) 50% of the tickets that were sold. This is (7000 - 80)/2 = 3460 tickets. These were sold at "10% higher than the average price".
3) the other 50% of tickets that were sold - so another 3460 tickets. We have no information on the selling price of these tickets.

Creating an equation with the above 3 groups would give:
revenue = 80*0 + 3460*(average + 10%) + 3460*(unknown number)
Using this: "average price of the sold tickets is $10"
we can solve the above equation but it isn't fun.

Alternatively, we can divide all the tickets in the question into two groups:
1) this is the same as above - tickets that weren't sold. Each gives $0 of revenue.
2) all the tickets that were sold - a total of 6920 tickets. Each gives $10 on average of revenue.
So, our total revenue is 80*0 + 6920*10 = 69,200.

This is a trick question because the entire middle part of the prompt - "and of the ones that were sold, 50 percent were sold at 10 percent higher than the average price."
is useless and misleading. If the question were instead:
"Of 7,000 concert tickets, 80 tickets were not sold. If the average price of the sold tickets is $10 what is the total revenue?"
It would be much easier, wouldn't it?

Hope that helps!


Thanks David,

I thought 10 % of the average price = 10% of 10 = 11

If I follow my assumption above it would end up = 10 * 3460 + 11 * 3460 = 72,660 which does not exist in the answer choices. :oops:

So I agree with your explanation.
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Re: Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 22 Jan 2018, 16:12
Bunuel wrote:
Of 7,000 concert tickets, 80 tickets were not sold and of the ones that were sold, 50 percent were sold at 10 percent higher than the average price. If the average price of the sold tickets is $10 what is the total revenue?

A. 70,000
B. 69,200
C. 70,800
D. 69,120
E. 69,080



We are told that there are 7000 concert tickets. If 80 are unsold, then there are 6920 sold tickets.
50% of 6920 = 3460 tickets

First 50% were sold at 10% higher than average price.
That means, 3460 tickets were sold at $11 dollars because the average price is $10 and 10% more than $10 is $11.
Therefore, 3460 x 11 = 38, 060

Other 50% of sold tickets i.e. remaining 3460 tickets, were sold at 10% LOWER than average price. THIS IS THE KEY WORD.
If half were sold at 10% more, then the other half obviously is sold at 10% less, so we have
3460 x 9 = 31,140
Why 9? (because 10% less than average of $10 is $9)

SO TOTAL REVENUE: 38,060 + 31,140 = 69, 200

ANSWER: B
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Re: Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 22 Jan 2018, 16:47
aanjumz92 wrote:
Bunuel wrote:
Of 7,000 concert tickets, 80 tickets were not sold and of the ones that were sold, 50 percent were sold at 10 percent higher than the average price. If the average price of the sold tickets is $10 what is the total revenue?

A. 70,000
B. 69,200
C. 70,800
D. 69,120
E. 69,080



We are told that there are 7000 concert tickets. If 80 are unsold, then there are 6920 sold tickets.
50% of 6920 = 3460 tickets

First 50% were sold at 10% higher than average price.
That means, 3460 tickets were sold at $11 dollars because the average price is $10 and 10% more than $10 is $11.
Therefore, 3460 x 11 = 38, 060

Other 50% of sold tickets i.e. remaining 3460 tickets, were sold at 10% LOWER than average price. THIS IS THE KEY WORD.
If half were sold at 10% more, then the other half obviously is sold at 10% less, so we have
3460 x 9 = 31,140
Why 9? (because 10% less than average of $10 is $9)

SO TOTAL REVENUE: 38,060 + 31,140 = 69, 200

ANSWER: B



From where did you get this assumption that other half sold less than 10%? It could possible that half sold at same price and other with 10% higher.
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Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha [#permalink]

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New post 22 Jan 2018, 18:28
Bunuel wrote:
Of 7,000 concert tickets, 80 tickets were not sold and of the ones that were sold, 50 percent were sold at 10 percent higher than the average price. If the average price of the sold tickets is $10 what is the total revenue?

A. 70,000
B. 69,200
C. 70,800
D. 69,120
E. 69,080


The highlighted part is a Tricky. \(It says that the 50 percent were sold at 10 percent higher than the average price - Here, the average price is not $10. Note that $10 is average price of sold tickets only\). Someone posted above that 80 tickets that weren't sold are of $0 value, this is wrong assumption. It might be that those 80 tickets were very expensive. So, its just a simple calculation of the total tickets sold i.e. 6920*10 = 69,200
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Of 7,000 concert tickets, 80 tickets were not sold and of the ones tha   [#permalink] 22 Jan 2018, 18:28
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