### 4. The compound interest on a certain sum for 2 years at 10% per annum is Rs. 1155. The simple interest on the same sum for double the time at half the rate percent per annum is ?

### 5. In what time will Rs. 3300 becomes Rs. 3399 at 6% per annum interest compounded half-yearly ?

### 6. What is the Compound interest on Rs. 5000 in 3 years, if the rate of interest is 4% for the first year, 3% for the second year and 2% for the third year?

### 10. The minimum number of half years in which a sum of money kept at 60% compound interest will be quadrupled is ?