A cycle is bought for Rs.840 and sold for Rs.1220, find the gain percent?  Pick one.
A) 70 %
B) 45 %
C) 48 %
D) 30 %
E) 40 %

Rationale: "explanation : 840 - - - - 380 100 - - - - ? = > 45 % answer : b"
Answer: B