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

What is the rate of interest (in $\%$) if simple interest earned on a certain sum for the $3^{rd}$ year is $₹ 2,000$ and compound interest earned in $2$ years is $₹ 4,160$?

Find the compound interest on $Rs. 12500$ at $8 \%$ per annum for $9$ months compounded quarterly (in $Rs.$).

Find the present worth (in ₹) of ₹ $9261$ due $3$ years hence at $5 \%$ per annum compounded yearly.

The difference between simple and compound interest compounded annually on a certain sum of money for $2$ years at $4 \%$ per annum is ₹ $8$. The sum is (In ₹):

The $S.I.$ is $Rs. 7200$ at $12$ $p.c.p.a.$ for $6$ years on a sum. What is the $C.I.$ (in $Rs.$) on the same sum at $5$ $p.c.p.a.$ for $2$ years?