If the cost of 12 books is equal to the selling price of 10 books, the profit per cent in the transaction is	Choose the correct choice from the following answers:
A) 16 2/3%	B) 18%	C) 20%	D) 25%	E) 30%
Let C.P. of 12 books = Rs 12   Therefore, S.P. of 10 books = Rs 12   C.P. of 10 books = Rs 10   Therefore, Profit = 20%   ANSWER:20%
<result>C</result>
If the cost of 12 books is equal to the selling price of 10 books, the profit per cent in the transaction is