The population of a state increases by $10 \%$ every year. If its population in the year $2003$ was $15$ lakhs,what was its population in the year $2005$ (in lakhs)?

If the compound interest on a sum for $2$ years at $12 \frac{1}{2} \%$ per annum is ₹ $510$,the simple interest (in ₹) on the same sum at the same rate for the same period of time is:

$A$ sum of money,deposited at some rate $p.c.p.a.$ of compound interest,doubles itself in $4$ years. In how many years will it become $16$ times of itself at the same rate?

The compound interest (in ₹) on ₹ $800$ for $2 \frac{1}{2}$ years at $5 \%$ per annum is:

The simple interest accrued on a certain principal is ₹ $2,000$ in five years at the rate of $4$ percent $p.a.$ What would be the compound interest (in ₹) accrued on the same principal at the same rate in two years?

The compound interest on a certain sum for $2$ years at $12 \%$ per annum,compounded annually is $Rs. 1272$. The simple interest (in $Rs.$) for that sum at the same rate and for the same period will be?