Nishit K Sinha Solutions for Chapter: Arithmetic, Exercise 2: Practice Exercises

A scheme invests $₹ 1000$ at simple interest rate of $5\%$on the condition that interest will be added to the principal after $10$$\mathrm{yr}$. In how many years will it amount to ₹$2000$?

The interests in the first two successive years were $₹ 400$ and $₹ 420$, respectively, when a sum of money is invested at CI. Find the sum.

Anand borrows a certain sum from Manisha at a certain rate of SI for $2 \mathrm{yr}.$ He lends this sum to Sunita at the same rate of interest but compounded annually for the same period, that is, $2\mathrm{yr}$. At the end of $2\mathrm{yr}$, he receives $₹ 2400$ as compound interest, but paid $₹ 2000$ as simple interest. What is the rate of interest?

If a sum on CI becomes three times in $4\mathrm{yr}$, then with the same interest rate, the sum will become $81$times in:

A sum is invested for $\mathrm{3 }\mathrm{yr}$ compounded at $5\%, 10\%,$and $20\%$ per annum, respectively. In $3\mathrm{yr}$, if the sum amounts to ₹ $1386$ , then find the sum.

A sum of ₹$6600$was taken as a loan. This is to be repaid in two annual installments. The rate of interest is $20\%$, which compounded annually. Find the value of each installment.

If in a certain time period, $₹ 10,000$ amount to $₹160,000$ at CI. What is the amount in half at that time if principal is ₹ $10,000$?

What will be the amount if a sum of $₹ 10,000$ is placed at CI for $3 \mathrm{yr}$ while rate of interest for the first, second, and third years is $10 \%, 5 \%,$and $2\%$, respectively?