By selling 150 apples, a fruit-seller gains the selling price of 30 apples. Find the gain percent? Select the correct option:  A) 30 %  B) 58 %  C) 25 %  D) 60 %  E) 12 %

Rationale: "option c explanation : sp = cp + g 150 sp = 150 cp + 30 sp 120 sp = 150 cp 120 - - - 30 cp 100 - - - ? = > 25 %"
Answer: C