How long will it take a certain amount to increase by 30% at the rate of 15% simple interest? Choose the correct choice from the following choices:
A) 20	B) 30	C) 40	D) 50	E) 60
Let the principal be Rs. x   Simple interest = x*30/100 = 3x/10   T = 100*SI/PR = 100*3x/10 / x*15 = 2%   Alternatively, this can be solved by considering principal amount to be Rs. 100. Then simple interest becomes Rs. 30. ANSWER : 30   Then, T = 100*30/100*15 = 2%
<result>B</result>
How long will it take a certain amount to increase by 30% at the rate of 15% simple interest?