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

A sum of money amounts to ₹4840 in 2 years and ₹5324 in 3 years at compound interest compounded annually. What is the rate of interest per annum?

A certain sum triples in 4 years at compound interest, interest being compounded annually. In how many years would it become 27 times itself ?

The compound interest on a sum for 5^(th) year is ₹ 7800 and compound interest for sixth year is ₹ 9048 (interest is compounded annually). What is the rate of interest?