1. A sum is invested at compound interest payable annually. The interest in two successive years was Rs. 500 and Rs. 540. The sum is:

2. The compound interest of Rs. 20480 at 6 �% per annum for 2 years 73 days is:

3. A sum of Rs.550 was taken as a loan. This is to be repaid in two equal annual instalments. If the rate of interest be 20% compounded annual by then he value of each instalment is: