A person buys an article at Rs.500. At what price should he sell the article so as to make a profit of 20%?

A. Rs.600
B. Rs.500
C. Rs.250
D. Rs.700
Explanation:
Cost price = Rs.500
profit = 20% of 500 = Rs.100
Selling price = Cost price + Profit
= 500 + 100 = 600