A sum of money invested at compound interest amounts in 2 years to Rs. 2,000 and in 3 years to Rs. 2,320. The interest rate per annum is:
1
6%
2
5%
3
10%
4
16%
A sum of money invested at compound interest amounts in 2 years to Rs. 2,000 and in 3 years to Rs. 2,320. The interest rate per annum is: