A sum of ₹ $1260$ is borrowed from a money lender at $10 \%$ p.a. compounded annually. If the amount is to be paid back in two equal annual instalments, find out the annual instalment (In ₹).

What will be the amount (In ₹) received on $25000$ at the rate of $20 \%$ per annum compounded yearly for $4$ years?

In year $2008,5000$ students were admitted in a college. It is found that the number of students admitted is constantly increasing by $24$ per cent per year. How many students will be admitted in the college in the year $2010 ?$

Mr. Dua invested money in two schemes $A$ and $B$ offering compound interest at $8 \%$ per annum and $9 \%$ per annum respectively. If the total amount of ineterest accrued through two schemes together in two years was ₹ $4818.30$ and the total amount invested was ₹ $27000$ . What was the amount (In ₹) invested in scheme $A$.

A tree increases annually by $\frac{1}{8}$ of its height. By how much will it increase (In $cm$) after $2$ years, if it stands today $64 cm$ high?

How many statements are useful for find this : 

What is the rate of interest percent $p.a.$?

$Statements:$

$I$. The difference between the compound interest and simple interest earned in two years on the amount invested is ₹ $100$.

$II$. The amount becomes ₹ $19,500$ in three years on simple interest.

$III$.The simple interest accrued in two years on the same amount at the same rate of interest is ₹ $3,000$.