Exercise

A sum amounts to $₹1326$ in $6$ years at $5$$\%$ p.a. simple interest. In what time will this sum double itself at the same rate of interest?

If $₹450$ amounts to $₹540$ at $4$ years at simple interest, find the sum that will amount to $₹637.50$ in $5$ years at the same rate of interest.

Sameer lent equal sums of money at $5\frac{1}{2}$ percent and $4$ percent per annum respectively for a period of $3$ years. If he earned $₹72$ more for the money lent out at $5\frac{1}{2}\%$, if the sum of money is $₹k$, then, find the value of $k$ lent at $4\%.$

Two equal sums were lent out at $7$$\%$ and $5\%$ interest respectively. The interests earned on the two loans add up to $₹960$ for $4$ years. What is the total sum lent out?

A sum lent out at simple interest becomes $₹4480$ in $3$ years and $₹4800$ in $5$ years. Find the sum and the rate of interest.

Amar and Chaman borrowed $₹2250$ and $₹2500$ respectively at the same rate of simple interest for $3\frac{1}{2}$ years. If Chaman paid $₹140$ more interest than Amar, find the rate of interest per annum.

Divide $₹2500$ into two parts such that the simple interest on one at $4\%$ for $5$ years is double that of the other at $5\%$ for $3$ years.

At same rate of simple interest, $A$ lent $₹6000$ to $B$ for $2$ years and $₹1500$ to $C$ for $4$ years and received $₹900$ as interest from both of them together. The rate of interest per annum was