By selling 45 books, a shopkeeper gains the price of 12 books. His gain per cent is Choose the correct choice from the following choices.
A) 35.35%  B) 37.37%  C) 38.38%  D) 36.36%  E) 39.39%
Suppose S.P of 45 books = Rs 45   Therefore, Gain = Rs 12 =&gt; C.P = Rs 33   Gain % = 12/33 x 100 = 36.36%   Gain = 36.36%   ANSWER:36.36%
<result>D</result>
By selling 45 books, a shopkeeper gains the price of 12 books. His gain per cent is