1.  Royalty on the book is less than the printing cost by :

A. 5%
B. 33.333%
C. 20%
D. 25%

Answer: Option D

Explanation:

Printing Cost of book = 20% of C.P.
Royalty on book = 15% of C.P.
Difference = (20% of C.P.) - (15% of C.P.)
= 5% of C.P.
 Percentage difference =   [ Difference      x 100] %
                                                Printing Cost
    
= [  5% of C.P.    x 100] % = 25%
      20% of C.P.    

Thus, Royalty on the book is 25% less than the Printing Cost.