A certain sum of money amounts to Rs. 678 in 2 years and to Rs. 736.50 in `3 1/2` years. The rate of interests is:

A certain sum of money amounts to Rs.678 in 2 years and to Rs.736.50 in 33(1)/(2) years.The rate of interests is:

A certain sum of money amounts to Rs. 2420 in 2 years and Rs. 2662 in 3 years at some rate of compound interest, compounded annually. The rate of interest per annum is:

A certain sum of money amounts to 756 in 2 years and to 873 in 3.5 years. Find the sum and the rate of interest.

A sum of money amounts to Rs. 2400 in 3 years and Rs. 2520 in 4 years on C.I. Find the rate of interest.