A sum of money is paid back in two annual instalments of ₹ $17,640$ each, allowing $5 \%$ compound interest compounded annually. The sum borrowed was (In ₹)

What will be the amount (In ₹) received on $25000$ at the rate of $20 \%$ per annum compounded yearly for $4$ years?

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

The simple interest accrued on an amount of $Rs. 19800$ at the end of $3$ years is $Rs. 7128$. What would be the compound interest (In $Rs.$) accrued on the same amount at the same rate in the same period?

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

Sita deposited ₹ $5,000$ at 10\% simple interest for $2$ years. How much more money (In ₹) will Sita have in her account at the end of two years, if it is compounded semi-annually?