A sum of mpmon deposited at compound interest amounts to Rs.2420 and to Rs.2662 in 3 years . Find the rate of interest .
A certain sum amounts to Rs 4840 in 2 years and to Rs 5324 in 3 years at compound interest. Find the rate and the sum.
In how many years will Rs 2000 amount to Rs 2662 at 10% p.a. compound interest?