A company has to replace a machine after 21 years for which it deposits Rs 30,000 every year in the beginning of the year. In all, there are 21 installments deposited at the rate of 5% p.a. Find the...

A company has to replace a machine after 21 years for which it deposits Rs 30,000 every year in the beginning of the year. In all, there are 21 installments deposited at the rate of 5% p.a. Find the future value.

A person deposits Rs 5,000 for one year to earn 10% interest p.a.. Find the total amount if: (a) interest is compounded semi-annually, and (b) interest is compounded quarterly.