Increasing the original price of an article by 15 percent and then increasing the new price by 15 percent is equivalent to increasing the original price by  Choose the correct option.
A) 32.25 %
B) 31.00 %
C) 30.25 %
D) 30.00 %
E) 22.50 %

Rationale: "you can do this by approximation , or with straight math by calculating 100 * 1.15 ^ 2 . or step by step : if you increase 100 by 15 % you ' ll get 115 , then if you increase 115 = 100 + 15 by 15 % again , 100 will gain 15 again and 15 will gain its 15 % which is 2.25 , so total gain is 15 + 2.25 = 17.25 - - > 115 + 17.25 = 132.25 . answer : a ."
Answer: A