If a sum doubles in 16 years, how much will it be in 8 years ?

Consider the following statements
If a sum of money is lent at simple interest, then the
I - money gets doubled in 5 years if the rate of interest is $$16\frac{2}{3}$$ %
II - money gets doubled in 5 years if the rate of interest is 20%.
III - money becomes four times in 10 years if it gets doubled in 5 years.

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 = ?

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 = ?

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

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

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

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 = ?

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 = ?

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 ?

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