A sum of ₹ 40,000 was lent for one year at 16% per annum. If the same sum is lent for the same time and at the same rate percent but compounded half-yearly, how much more will the interest be ?

Find the amount on ₹ 36,000 after 2 years, compounded annually, the rate of interest being 10% for the first year and 12% for the second year.

The difference between the compound interest and the simple interest accrued on an amount of ₹ 18,000 in 2 years is ₹ 405. Find the rate of interest per annum.

The cost of a car, purchased 2 years ago, depreciates at the rate of 20% per year. If its present value is ₹ 3,15,600; find :

(i) its value after 2 years.

(ii) its value, when it was purchased 2 years ago.