At what rate per cent per annum will ₹ $1000$ amount to ₹ $1331$ in $3$ years? The interest is compounded yearly.

A sum of $Rs. 1000$ after $3 \,years$ at compound interest becomes a certain amount that is equal to the amount that is the result of a $3 \,year$ depreciation from $Rs. 1728$. Find the difference between the rates (In $\%$) of $C.I.$ and depreciation? (Given $C.I.$ is $10 \%$ $p.a.$)

If the simple interest on a sum of money for $2$ years at $5 \%$ per annum is ₹ $50,$ what is the compound interest (In ₹) on the same sume at the same rate and for the same time?

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

The difference between the compound and simple interest on a sum of money for $2$ years at $6 \frac{1}{4} \%$ per annum is $Rs.$ $10$. The sum (In $Rs.$) is

A certain sum of money at compound interest grows up to ₹ $12960$ in $2$ years and up to ₹ $13176$ in $3$ years. Find the rate per cent per annum.