₹ $800$ at $5 \%$ per annum compound interest amounts to ₹ $882$ in how many years?

$A$ man borrows ₹ $3825$ to be paid back with compound interest at the rate of $4 \%$ per annum by the end of $2$ years in two equal yearly instalments. How much will be each instalment (in ₹)?

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

The difference between compound and simple interest at a certain rate on $Rs. 2000$ at the end of two years is $Rs. 12.8$. The rate of interest (in $\%$) per annum is:

What would be the compound interest (in $Rs.$) accrued on an amount of $Rs. 7400$ at $13.5$ $p.c.p.a.$ at the end of $2$ years? (rounded off to two digits after decimal)

The population of a country is $10$ crore and it is expected that the population will become $13.31$ crore in $3$ years. What will be the annual growth rate in percent?