Question

On a certain rate of interest a sum of Rs 5000 becomes Rs 16,200 in certain years at compound interest. In half of the time given, this sum will become?

Answer 1

a_______ b ________c

5000 _______ x _______ 16,200

_______ t _____ t ______

As we have to calculate the sum for half time, both time period is same.

Hence $a:b=b:c$

$5000:x=x:16200$

$\frac{500}{x}=\frac{x}{16200}$

$\Rightarrow x^2=5000\times 16200$

$x=\sqrt{5000\times 16200}=Rs9000$