Find the difference between $S.I.$ and $C.I.$ (in $Rs.$) at $12 \%$ per annum for $2$ years on $Rs. 10000$.

$A$ sum of money at compound interest doubles itself in $15$ years. It will become eight times of itself in (in $years$):

The difference between the compound interest and simple interest on a certain sum at $3 \%$ per annum for $3$ years is ₹ $27.27$. The sum is (in ₹):

What sum will amount (in ₹) to ₹ $15916.59$ in $3$ years at compound interest,if the interest rates for the first,second,and third year are $3\%$,$2\%$,and $1\%$ respectively?

What sum will give ₹ $244$ as the difference between simple interest and compound interest at $10 \%$ per annum in $1 \frac{1}{2}$ years,compounded half-yearly?

The difference between the simple interest and the compound interest (in ₹) on ₹ $600$ for $1$ year at $10 \%$ per annum,reckoned half-yearly is