BTGmoderatorDC wrote:Last year, the price of a jar of peanut butter at a certain store was P dollars and the price of a jar of jelly at the same store was J dollars, where J=2P. This year, the price of peanut butter increased by 20% and the price of jelly decreased by 20%. If a customer purchases one jar of peanut butter and one jar of jelly this year and receives a 25% discount, which of the following represents the amount that he paid, in terms of P?
A. 3P/2
B. 17P/10
C. 19P/10
D. 21P/10
E. 11P/5
The price of a jar of peanut butter at a certain store was P dollars and the price of a jar of jelly at the same store was J dollars, where J=2P.
Let P = 10 and J = 20
This year, the price of peanut butter increased by 20% and the price of jelly decreased by 20%
New P = 10 + (20% of 10) = 10 + 2 = 12
New J = 20 - (20% of 20) = 20 - 4 = 16
A customer purchases one jar of peanut butter and one jar of jelly this year and receives a 25% discount.
Before the discount:
New P + New J = 12 + 16 = 28
After the discount:
28 - (25% of 28) = 28 - 7 = 21
Which of the following represents the amount that he paid, in terms of P?
The correct answer must yield $21 when P=10.
Only D works:
21P/10 = (21*10)/10 = 21.
The correct answer is
D.
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