1.  If for an edition of the book, the cost of paper is Rs. 56250, then find the promotion cost for this edition.

A. Rs. 20,000
B. Rs. 22,500
C. Rs. 25,500
D. Rs. 28,125

Answer: Option B

Explanation:

Let the Promotion Cost for this edition be Rs. p.
Then, 25 : 10 = 56250 : p
 p = Rs.  56250 x 10 / 25 
        = Rs. 22500.