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To raise funds, a racing team sold T-shirts imprinted with

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Re: To raise funds, a racing team sold T-shirts imprinted with [#permalink]
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guerrero25 wrote:
To raise funds, a racing team sold T-shirts imprinted with the team's logo. The team paid their supplier a one-time setup fee of $100. Because they purchased at least 50 T-shirts, the team qualified for their supplier's quantity discount of x cents per T-shirt and paid (8-(x/100)n) dollars for each of the n T shirts they purchased. What is the value of x? Fantastic DS Question. One-time setup fee =$100
Discount per t-shirt = x cents
Price per t-shirt = $(8 - n($$\frac{x}{100}$$)) x = ? Quote: 1. The team purchased 200 T-shirts, sold each T-shirt for$12, and made a $900 profit. 2. In addition to the$100 setup fee, the team paid $7 for each T-shirt. 1) n = 200 SP =$12
=> Total Selling Price = $2400 Profit =$900
=> Cost = 2400 - 900 - 100
=> Cost = $1400 1400 = 8 - ($$\frac{x}{100}$$)*200 We can solve for x. Sufficient. 2) 7 = (8 - n($$\frac{x}{100}$$)) 2 variables and 1 equation. Insufficient. A is the answer. Manager Joined: 27 Dec 2016 Posts: 195 Own Kudos [?]: 185 [0] Given Kudos: 285 Concentration: Marketing, Social Entrepreneurship GPA: 3.65 WE:Marketing (Education) Re: To raise funds, a racing team sold T-shirts imprinted with [#permalink] guerrero25 wrote: To raise funds, a racing team sold T-shirts imprinted with the team's logo. The team paid their supplier a one-time setup fee of$100. Because they purchased at least 50 T-shirts, the team qualified for their supplier's quantity discount of x cents per T-shirt and paid (8-(x/100)n) dollars for each of the n T shirts they purchased. What is the value of x?

1. The team purchased 200 T-shirts, sold each T-shirt for $12, and made a$900 profit.
2. In addition to the $100 setup fee, the team paid$7 for each T-shirt.

Dear expert, mikemcgarry, GMATPrepNow

I have a question about statement 2 : I think statement 2 is SUFFICIENT because of n=1. Why we don't plug n=1 in this equation, so we can get X?

Thanks!
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Re: To raise funds, a racing team sold T-shirts imprinted with [#permalink]
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septwibowo wrote:
guerrero25 wrote:
To raise funds, a racing team sold T-shirts imprinted with the team's logo. The team paid their supplier a one-time setup fee of $100. Because they purchased at least 50 T-shirts, the team qualified for their supplier's quantity discount of x cents per T-shirt and paid (8-(x/100)n) dollars for each of the n T shirts they purchased. What is the value of x? 1. The team purchased 200 T-shirts, sold each T-shirt for$12, and made a $900 profit. 2. In addition to the$100 setup fee, the team paid $7 for each T-shirt. Dear expert, mikemcgarry, GMATPrepNow I have a question about statement 2 : I think statement 2 is SUFFICIENT because of n=1. Why we don't plug n=1 in this equation, so we can get X? Thanks! Dear septwibowo, I'm happy to respond. My friend, on GMAT DS, it is absolutely crucial to be completely clear on what could be true vs. what has to be true. What could be true tells us bupkis about sufficiency. Only what has to be true tells us about sufficiency. I am not sure where you got n = 1. The problem tells us explicitly that $$n \geq 50$$, so this rules out the possibility of n = 1. Let's say n = 100, which would be possible: yes, knowing n = 100 would make the equation very easy to solve for X, but once again, our convenience and ease, in and of itself, tells us zilch about sufficiency. The prompt gives us two variables, n & x. As a very good rule of thumb, we need two separate equations to solve for the values of two variables. The GMAT loves to test this fact in word problems on the DS questions. See: GMAT Quant: How to Solve Two Equations with Two Variables Does all this make sense? Mike Manager Joined: 27 Dec 2016 Posts: 195 Own Kudos [?]: 185 [0] Given Kudos: 285 Concentration: Marketing, Social Entrepreneurship GPA: 3.65 WE:Marketing (Education) Re: To raise funds, a racing team sold T-shirts imprinted with [#permalink] mikemcgarry wrote: septwibowo wrote: guerrero25 wrote: To raise funds, a racing team sold T-shirts imprinted with the team's logo. The team paid their supplier a one-time setup fee of$100. Because they purchased at least 50 T-shirts, the team qualified for their supplier's quantity discount of x cents per T-shirt and paid (8-(x/100)n) dollars for each of the n T shirts they purchased. What is the value of x?

1. The team purchased 200 T-shirts, sold each T-shirt for $12, and made a$900 profit.
2. In addition to the $100 setup fee, the team paid$7 for each T-shirt.

Dear expert, mikemcgarry, GMATPrepNow

I have a question about statement 2 : I think statement 2 is SUFFICIENT because of n=1. Why we don't plug n=1 in this equation, so we can get X?

Thanks!

Dear septwibowo,

I'm happy to respond.

My friend, on GMAT DS, it is absolutely crucial to be completely clear on what could be true vs. what has to be true. What could be true tells us bupkis about sufficiency. Only what has to be true tells us about sufficiency.

I am not sure where you got n = 1. The problem tells us explicitly that $$n \geq 50$$, so this rules out the possibility of n = 1. Let's say n = 100, which would be possible: yes, knowing n = 100 would make the equation very easy to solve for X, but once again, our convenience and ease, in and of itself, tells us zilch about sufficiency.

The prompt gives us two variables, n & x. As a very good rule of thumb, we need two separate equations to solve for the values of two variables. The GMAT loves to test this fact in word problems on the DS questions. See:
GMAT Quant: How to Solve Two Equations with Two Variables

Does all this make sense?
Mike

Thank you mikemcgarry for your explanation. I understand 100% with your explanation.

However, this is the reason why I think that n=1.

In addition to the $100 setup fee, the team paid$7 for each T-shirt.

Whatever the n shirts they buy, but if the team paid $7 for EACH means n=1 right? I buy 100 iPhone and I should pay 1.000 USD each. This is one that makes me confused. Magoosh GMAT Instructor Joined: 28 Dec 2011 Posts: 4490 Own Kudos [?]: 28861 [3] Given Kudos: 130 Re: To raise funds, a racing team sold T-shirts imprinted with [#permalink] 2 Kudos 1 Bookmarks Expert Reply septwibowo wrote: Thank you mikemcgarry for your explanation. I understand 100% with your explanation. However, this is the reason why I think that n=1. In addition to the$100 setup fee, the team paid $7 for each T-shirt. Whatever the n shirts they buy, but if the team paid$7 for EACH means n=1 right?

I buy 100 iPhone and I should pay 1.000 USD each.

This is one that makes me confused.

Dear septwibowo,

I'm happy to respond.

My friend, this is a very common mistake: people often confuse the language used to express a rate for information about a total amount or number.

For example, suppose a problem says, "On Tuesday, ABC store was selling shirts at the rate of 3 shirts for $50." That "3 shirts for$50" is information about a rate, about a ratio, but this doesn't mean that the store sold exactly three shirts or only three shirts on Tuesday---that store might have sold hundreds of shirts at that price. In fact, we know that if the store sold 150 shirts that day, they would have taken in $2500 in revenue for the day. A gas station may sell gas at a rate of$3/gallon, but this doesn't mean that a driver can spend only $3 or can get only 1 gallon. This number merely give the ratio: if I put 15 gallons into my tank, that will cost me$45.

Much in the same way, this information:
the team paid $7 for each T-shirt is rate information: the word "each" does mean 1, and indeed, there's a 1 in the ratio: ($7):(1 shirt). That's the rate or ratio, but that says absolutely nothing about the total number of shirts. By contrast, n is the total number of shirts, so the total cost (not including the flat fee) would be $7n. Does this distinction make sense? Mike Intern Joined: 07 Jul 2017 Posts: 7 Own Kudos [?]: 3 [0] Given Kudos: 14 Re: To raise funds, a racing team sold T-shirts imprinted with [#permalink] Hello mike , I got the same doubt of septwibowo...Your explanation is very clear thanks a lot! I think the misunderstanding is generated by wrongly interpreting the equation (8-(x/100)n). At first I thought of it as a Price*Discount*Quantity = total cost paid for the t-shirts (in this case i think septwibowo approach would have been solid). However, this equation has a totally different meaning: it puts in relation discount and total number of tshirts to give the price paid for each tshirt, therefore (8-(x/100)n) = price paid for each t shirt. In this case it becomes clear why we cannot arbitrarily consider n=1 to solve the problem. Does it make sense? Hope this clarification, if correct, might help others with the same doubt. Director Joined: 09 Jan 2020 Posts: 953 Own Kudos [?]: 235 [0] Given Kudos: 432 Location: United States Re: To raise funds, a racing team sold T-shirts imprinted with [#permalink] In statement 2, we don't know the value of the discount. Based on the statement, we can only conclude that after the t-shirt was discounted, the team paid$7 per shirt.

We can make the following equation provided by the information in statement 2:

$$7 = (8-\frac{x}{100}n)$$ dollars

However, without knowing what n is, we can't determine the value of x. If n = 50, then x = 2. If n = 100, then x = 1.

$$7 = (8-\frac{2}{100}50)$$ dollars

$$7 = (8-\frac{1}{100}100)$$ dollars

We can't determine the value of x cents based off statement 2 alone.
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Re: To raise funds, a racing team sold T-shirts imprinted with [#permalink]
In statement 2, we don't know the value of the discount. Based on the statement, we can only conclude that after the t-shirt was discounted, the team paid \$7 per shirt.

We can make the following equation provided by the information in statement 2:

$$7 = (8-\frac{x}{100}n)$$ dollars

However, without knowing what n is, we can't determine the value of x. If n = 50, then x = 2. If n = 100, then x = 1.

$$7 = (8-\frac{2}{100}50)$$ dollars

$$7 = (8-\frac{1}{100}100)$$ dollars

We can't determine the value of x cents based off statement 2 alone.

Doesn't n stand for the number of shirts?

So in statement 2, if we substitute n with 1, we get 7 = 1*( 8 - x/100) => x=100?

What's wrong with this?
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Re: To raise funds, a racing team sold T-shirts imprinted with [#permalink]
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