Swati took a loan of Rs. 16000 against her insurance policy at the rate of 12% per annum. Calculate the total compound interest payable by Swati after 3 years.

Find the compound interest on Rs. 1000 at the rate of 8% per annum for 1 years when interest is compounded half yearly.

Find the compound interest on Rs. 160000 for one year at the rate of 20% per annum, if the interest is compounded quarterly.

Roma borrowed Rs. 64000 from a bank for 1years at the rate of 10% per annum. Compare the total compound interest payable by Roma after 1years, if the interest is compounded half-yearly.

Mewa lal borrowed Rs. 20000 from his friend Rooplal at 18% per annum simple interest. He lent it to Rampal at the same rate but compounded annually. Find his gain after 2 years.