Hi ..The answer is - D. 400p / (500 – p). I will do my best to explain.

Let a be the no. of newspapers sold of type A, similarly b...Type B

Total revenue by sale = 1*a + 1.25b

Given the first condition 1*a = total rev *r/100 = (1*a + 1.25b)* r/100

Given second condition a = (total newspapers sold) *p/100 = (a+b) * p/100

Solve both equations for b/a and equate, you will get the answer r = 400p / (500 – p)

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