What would be the $C.I.$ on $Rs. 17500$ at the rate of $12$ $p.c.p.a.$ after $2$ years (in $Rs.$)?

Albert invested an amount of ₹ $8000$ in a fixed deposit scheme for $2$ years at a compound interest rate of $5 \%$ per annum. How much amount (in ₹) will Albert get on maturity of the fixed deposit?

$A$ man borrows ₹ $4000$ from a bank at $7 \frac{1}{2} \%$ compound interest. At the end of every year,he pays ₹ $1500$ as part repayment of the loan and interest. How much does he still owe to the bank after three such instalments (in ₹)?

The simple interest accrued on an amount of $Rs. 20000$ at the end of $3$ years is $Rs. 7200$. What would be the compound interest accrued on the same amount at the same rate in the same period?

$A$ man borrows ₹ $25000$ at $20 \%$ compound interest. At the end of every year,he pays ₹ $5000$ as part repayment. How much (in ₹) does he still owe after three such instalments?

In how many years will a sum of ₹ $800$ at $10 \%$ per annum compounded semi-annually become ₹ $926.10$?