A shopkeeper buys 80 pens at Rs. 12 each. He sells all pens at Rs. 15 each. Find his profit percent

A. 20%
B. 22%
C. 24%
D. 25%

Solution:
CP = 80×12 = 960, SP = 80×15 = 1200
Profit = 240 → %Profit = (240/960)×100 = 25%
Answer: D