What sum will amount (In ₹) to ₹ $15916.59$ in $3$ years at compound interest, the interest for first, second and third year being $3,2$ and $1$ per cent, respectively?

A man gave $50 \%$ of his savings of ₹ $84,100$ to his wife and divided the remaining sum among his two sons $A$ and $B$ of $15$ and $13$ years of age respectively. He divided it in such a way that each of his sons, when they attain the age of $18$ years, would receive the same amount at $5 \%$ compound interest per annum. The share of $B$ was (In ₹)

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

The compound interest (In ₹) on ₹ $10000$ at $20 \%$ per annum at the end of $1$ year $6$ months if the interest is calculated half-yearly will be

What will be the compound interest (In ₹) on a sum of ₹ $1875$ after $2$ years if the rate of interest for the first year is $4 \%$ and that for the second year is $8 \% ?$

The compound interest on $\$ 1,800$ at $10 \%$ per annum for a certain period of time is $\$ 378 .$ Find the time in years.