The C.P of 15 books is equal to the S.P of 19 books. Find his gain% or loss%?	Select: A) 16 2/3% loss B) 16 2/8% loss C) 21 1/19% loss D) 36 2/3% loss E) 56 2/3% loss
15 21 1/19% lossP = 19 SP   19 --- 4 21 1/19% lossP loss   100 --- ? =&gt; 21 1/19% loss   Answer:21 1/19% loss
<result>C</result>
The C.P of 15 books is equal to the S.P of 19 books. Find his gain% or loss%?