What will be $C.I.$ (In $Rs.$) on an amount of $Rs. 10000$ at the rate of $20$ $p.c.p.a.$ in two years if the interest rate is compounded half yearly?

If $64000$ is deposited at $5 \%$ compound interest for a period of $18$ months, interest being compounded half-yearly, find the amount.

Find the difference between $C.I. \& S.I.$ on $Rs. 15000$ at $3 \%$ per annum for $3$ years?

Aditya invest $Rs. 50,000$ in a fixed deposit at $10 \%$ $C.I.$ for $2$ years. At the end of $2$ years she put the money in another deposit at $12 \%$ $S.I.$ for $3$ years. What was the final value (In $Rs.$)  of the initial Investment?

A man borrows $Rs. 5100$ to be paid back with compound interest at the rate of $4 \%$ pa by the end of $2$ years in two equal yearly instalments. How much (In $Rs.$) will be each instalment?

If the rate of interest be $4 \%$ per annum for first year, $5 \%$ per annum for second year and $6 \%$ per annum for third year, then the compound interest of $Rs. 10000$ for $3$ years will be (In $Rs.$)