Interest on Rs 1200 for years at the rate of 15% per annum is Rs 180.

If a bicycle was bought for Rs 650 and sold for Rs 585, then the percentage of profit is 10.

Sushma sold her watch for Rs 3320 at a gain of Rs 320. For earning a gain of 10% she should have sold the watch for Rs 3300.

Amount received after depositing Rs 800 for a period of 3 years at the rate of 12% per annum is Rs 896.

Rs 6400 were lent to Feroz and Rashmi at 15% per annum for and 5 years respectively. The difference in the interest paid by them is Rs 150.