Question 151. In a certain time, the ratio of a certain principal and interest obtained from it are in the ratio 10 : 3 at 10% interest per annum. The number of years for which the money was invested is = ?

Question 152. Jhon invested a sum of money at an annual simple interest rate of 10%. At the end of four years the amount invested plus interest earned was Rs. 770. The amount invested was = ?

Question 153. In what time will Rs. 1860 amount to 2641.20 at simple interest 12% per annum ?

Question 154. The simple interest on a sum of money at 8% per annum for 6 years is half the sum. The sum is:

Question 155. In how much time would the simple interest on a certain sum be 0.125 times the principal at 10% per annum?

Question 156. The population of a village decreases at the rate of 20% per annum. If its population 2 years ago was 10000, the present population is = ?

Question 157. Rs. 12000 is divided into two parts such that simple interest on the first part for 3 years at 12% per annum may be equal to the simple interest on the second part for $$4\frac{1}{2}$$ years at 16% per annum. The ratio of the first part to the second part is = ?

Question 158. A person who pays income tax at the rate of 4 paise per rupee, find that fall of interest rate (income tax) from 4% to 3.75% diminishes his net yearly income by Rs. 48. What is his capital ?

Question 159. A person invests Rs. 12000 as fixed deposit at a bank at the rate of 10% per annum simple interest. But due to some pressing needs he has to withdraw the entire money after three years, for which the bank allowed him a lower rate of interest. If he gets Rs. 3320 less than what he would have got at the end of 5 years, the rate of interest allowed by the bank is = ?

Question 160. A certain scheme of investment in simple interest declares that it triples the investment in 8 years. If you want to quadruple the money through that scheme for how many years you have to invest for = ?