adub35 wrote:

Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day. If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper A, which of the following expresses r in terms of p?

A. 100p / (125 – p)

B. 150p / (250 – p)

C. 300p / (375 – p)

D. 400p / (500 – p)

E. 500p / (625 – p)

D. By Plug-in numbers.

Let’s say that the number of Newspapers sold was:

A: 10

B: 40

10+40(5/4)=60

r=100/6=50/3

p=100/5=20

Then using the answers I get D.

8000/480=50/3 = r

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Who is John Galt?