I got D.. What's the OA? Long explanation. So don't want to type if this is not the OA

Yes,The OA is D
Is it possible for you to explain

saurabh,
Refer the explanation below -
Say,
News A News B Total Rev Total No of News
--------- --------- ----------- -------------------
x y z k

Now x = pk/100
y = k - pk/100

RA (Revenue for A) = pk/100
RB (Revenue for B) = 125/100 * (k - pk/100)

RA + RB = z = 125k/100 - pk/100

Therefor, r = RA/(RA + RB) * 100
= 400p/(500 - p)

So the correct answer is - D. Now got it saurabh?

Thanks Dude

Thank u sir! At your service any time ...

This is how I did it

Suppose he sold x nos of Paper A and y nos of paper B

Revenues from papers = x*1+y*1.25

No if papers = x+y

Now the questions says
(x/(x+1.25y))*100=r => y/x= (100/r -1)*(4/5)----- (1)

(x/(x+y))*100=p => y/x=100/p - 1 -----(2)

Equate eq 1 and 2 and solve for r

you get 400P/(500-p)

PS: the trick is to write 1.25 as 5/4. This makes your calculation easy