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If a discount of 20% off the retail price of a desk saves Mark $45, ho

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If a discount of 20% off the retail price of a desk saves Mark $45, ho  [#permalink]

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New post 09 Aug 2019, 02:05
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

95% (01:05) correct 5% (02:00) wrong based on 44 sessions

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Re: If a discount of 20% off the retail price of a desk saves Mark $45, ho  [#permalink]

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New post 09 Aug 2019, 02:15
let retail price be = x

retail price after a discount of 20% = 0.8x

he saves 45 = 0.2x (equal to discount)
x = \(\frac{45}{0.2}\)

amount of money that he paid = 0.8x = \(\frac{0.8*45}{0.2}\)= 45*4 = 180

C is the answer
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Re: If a discount of 20% off the retail price of a desk saves Mark $45, ho  [#permalink]

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New post 10 Aug 2019, 02:42
Bunuel wrote:
If a discount of 20% off the retail price of a desk saves Mark $45, how much did he pay for the desk?

A. $145
B. $160
C. $180
D. $210
E. $215


given
retail price - discount price = 45
let retail price = x
so discount price ; x*.8
solve for x ; x-.8x = 45 ; x= 225
so 20% discount ; 225*.8 ; 180
IMO C
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Re: If a discount of 20% off the retail price of a desk saves Mark $45, ho  [#permalink]

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New post 11 Aug 2019, 00:41
Using ratio and proportion.
20%(discount on cost of desk):$45
80%(amount paid for the desk):y
y=80*45/20 = $180

Hence C.
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Re: If a discount of 20% off the retail price of a desk saves Mark $45, ho  [#permalink]

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New post 11 Aug 2019, 00:59
1
Even though answers were already provided, I find this solution easier. Hope it helps.

Given 20% = 45 (discount)
Thus 100% = 225 (original price)

How much paid? = original price - discount
180 = 225 - 45
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Re: If a discount of 20% off the retail price of a desk saves Mark $45, ho  [#permalink]

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New post 12 Aug 2019, 19:16
Bunuel wrote:
If a discount of 20% off the retail price of a desk saves Mark $45, how much did he pay for the desk?

A. $145
B. $160
C. $180
D. $210
E. $215


We can let n = the retail price of the desk and create the equation:

0.8n = n - 45

45 = 0.2n

225 = n

So he paid 0.8 x 225 = 180 dollars.

Answer: C
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Re: If a discount of 20% off the retail price of a desk saves Mark $45, ho  [#permalink]

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New post 12 Aug 2019, 19:18
Bunuel wrote:
If a discount of 20% off the retail price of a desk saves Mark $45, how much did he pay for the desk?

A. $145
B. $160
C. $180
D. $210
E. $215


20% x = 45
80% x = 180

IMO C

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Re: If a discount of 20% off the retail price of a desk saves Mark $45, ho   [#permalink] 12 Aug 2019, 19:18
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