Garima borrowed ₹ 40,000 at 10% p.a. simple interest. She immediately inverted this money at 10% p.a., compounded half-yearly. Calculate Garima's gain in 18 months.

At the beginning of year 2011, a man had ₹ 22,000 in his bank account. He saved some money by the end of this year and deposited it in the bank. The bank pays 10% per annum compound interest and at the end of year 2012 he had ₹ 39,820 in his bank account. Find, what amount of money he had saved and deposited in his account at the end of year 2011 .

If the amounts of two consecutive years on a sum of money are in the ratio 20 : 21, find the rate of interest.

The cost of a car, purchased 2 years ago, depreciates at the rate of 20% every year.If its present value is ₹ 2,52,480, find:

(i) its purchase price.

(ii) its value after 1 year.