If the rate of interest is `20%` per annum compounded in every 6 months, then what is the effective rate of interest per annum?

Shyam deposited Rs. 7500 for 6 months in a bank. If the rate of compound interest be 8% per annum and interest is compounded at the interval of 3 months, then what amount will Shyam obtain after 6 months?

A sum of money invested at simple interest becomes 13/10 of itself in 2 years and 6 months. What is the rate (in percentage) of interest per annum?

The simple interest and compound interest on a certain sum for 2 years are Rs. 2400 and Rs. 2640 respectively. The rates of interests (in % per annum) for both are the same. The interest on the sum lent at compound interest is compounded annually. Find the rate of interest (in % per annum).

What will be the compound interest on Rs 4000 in two years when rate of interest is 5% per annum?

What will be the compound interest on Rs 4000 in two years when rate of interest is 5% per annum?