Rohit invested some amount at the rate of $6$ per cent pa and at the end of $3$ years he got ₹ $8730$ simple interest. How much compound interest (in ₹) he will get on same amount and same rate of interest after $2$ years.

Find the compound Interest on $Rs. 32000$ at $20 \%$ per annum for $1$ $year$, compounded half yearly (In $Rs.$)

Raghu invested a certain sum in Scheme $X$ for $4$ years.Scheme $X$ offers simple interest at $12$ per cent pa for the firsttwo years and compound interest (compounded annually) at $20$ per cent pa for the next two years. The total interest earned by him after $4$ years is ₹ $11016 .$ What was the sum (In ₹) invested by Raghu in Scheme $X ?$

Divide $Rs. 2602$ between $X$ and $Y$, so that the amount of $X$ after $7 \,yr$ is equal to the amount of $Y$ after $9 \,yr$, the interest being compounded at $4 \%$ pa.

If a sum of money compounded annually becomes $1.44$ times of itself in $2$ years, then the rate of interest per annum (In $\%$) is