The simple interest on a certain sum for 3 years is Rs. 1080 and the compound interest on the same sum at the same rate for 2 years is Rs. 741.60. Find :
1. The rate of interest.
2. The principal.
The simple interest on certain sum for 3 years is rupees 225 and the compound interest on the sum at the same rate for 2 years is Rs 153 find the rate of interest and principal