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.

If the difference between the simple interest and compound interest earned on an amount @ $15$ $p.c.p.a.$ at the end of $3$ years is $Rs. 595.35$ what is the amount (In $Rs.$) ?

A sum of $Rs. 8448$ is to be divided between $X$ and $Y$ who are respectively $18$ and $19 \,yr$ old, in such a way that if their shares be invested at $6.25 \%$ per annum at compound interest, they will receive equal amounts on attaining the age of $21 \,yr$. The present share of $X$ is (In $Rs.$)

If in a certain number of years, ₹ $3000$ amounts to ₹ $4320$ at a compound interest, in half that time ₹ $3000$ will amount to (In ₹) 

Find the least number of complete years in which a sum of $Rs. 1500$ at $25 \%$ compound interest will be more than double.