A cycle is bought for Rs.670 and sold for Rs.880, find the gain percent? Choose the correct choice from the following
A) 31 %  B) 35 %  C) 54 %  D) 38 %  E) 80 %

Rationale: "explanation : 670 - - - - 210 100 - - - - ? = > 31 % answer : a"
Answer: A