Compound Interest#!#Rate Compounded Annually or Half Yearly

If Rs. 2500 becomes to Rs. 2970.25 in 2 years at compound interest compounded annually, what is the yearly rate of interest (in %) ?

A sum of ₹14000 is lent at compound interest (interest is compounded annually) for 3 years. If the rate of interest is 10%, then what will be the compound interest?

If Rs 12000 is invested for two years at compound interest (compounded annually ) at the rate of 20% per annum, then what is the interest ?

A principal sum of money is lent out at compound interest compounded annually at the rate of 20% per annum for 2 years. It would give ₹ 2410 more if the interest is compounded half yearly. Find the principal sum.

A certain sum becomes 16 times in 4 years at compound interest, compounded annually. What is the rate of interest?