Question

The interest on a certain sum lent at compound interest, the interest being compounded
annually, in the 2nd year is Rs.1200. The interest on it in the 3rd year is Rs 1440. Find the
rate of interest per annum.

A] 10% B] 15% C] 20% D] 25%​

Answer 1

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Step-by-step explanation:

Answer 2

Answer: C

 Answer: C : 20%

 

Step-by-step explanation:

int on 2nd year =1200

int on 3rd year =1440

diff of the interests =240

this 240 is caused by int on int 1200

so percentage =$\frac{240}{1200}$×100%

                         =20%