1.  For an edition of 12,500 copies, the amount of Royalty paid by the publisher is Rs. 2,81,250. What should be the selling price of the book if the publisher desires a profit of 5% ?

A. Rs. 152.50
B. Rs. 157.50
C. Rs. 162.50
D. Rs. 167.50

Answer: Option B

Explanation:

Clearly,  S.P. of the book = 105% of C.P.
Let the selling price of this edition (of 12500 books) be Rs. X.
There, 15 : 105 = 281250 : X
 X = Rs.  105 x 281250 / 15 
         = Rs. 1968750.
 S.P of one book = Rs.  1968750 / 12500 
                               = Rs. 157.50