Vijeta Competitions Editorial Board Solutions for Chapter: Compound Interest, Exercise 3: PRACTICE EXERCISE

A man invested ${\frac{1}{3}}^{rd}$ of his capital at $7\%, {\frac{1}{4}}^{th}$ at the rate of $8\%$ and the remaining at $10\%$. If his annual income is $₹561$, the capital is?

A certain sum doubles itself in period of $5$ years at a certain rate of simple interest. At the same rate of interest $₹300$ will amount to $₹2100$ in?

A sum of money doubles in $20$ years at the simple rate of interest. In how many years will it became four times?

The compound interest on a certain sum for the first year at $4\%$ is $₹25$. The compound interest for $2$ years at the same rate on the sum will be?

The simple interest on a certain principal at the rate of $9.5$ percent per annum is $₹950$ for two years. How much will be the additional interest on the same amount for the same period at the rate of $10.5$ percent per annum?

What is the difference between the simple and the compound interest on ₹400 for 2 years at 5%p.a?

What will be the total compound interest on $₹8000$ at the rate of $5$ p.c.p.a. at the end of three years?

The difference between the simple interest on a certain sum at the rate of 10% per annum for 2 years and compound interest which is compounded every 6 months is ₹124.05. What is the principal sum?