A man buy a book in Rs50 & sale it Rs80. What is the rate of profit ???	Choose the correct answer:  A) 10 %  B) 60 %  C) 30 %  D) 25 %  E) 28 %

Rationale: "cp = 50 sp = 80 profit = 80 - 50 = 30 % = 30 / 50 * 100 = 60 % answer : b"
Answer: B