Practice30Create account

A sum of money doubles itself in 5 years at compound interest.
In how many years will it become 4 times itself at the same rate?

Class 8Compound InterestComparing Quantities
  • A10 years
  • B8 years
  • C15 years
  • D20 years

Step-by-Step Solution

Doubling factor 2 in 5 years. To become times needs twice the time = 10 years.
Answer: A) 10 years

Master this chapter in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Compound Interest practice questions

More Class 8 Compound Interest practice

A trader in Surat invests Rs 8000 for 1.5 years at 10% per annum compounded annually.…The difference between compound interest and simple interest on a sum for 3 years at 10%…Priya invests equal sums in two schemes. Scheme A gives 10% per annum compounded…A startup in Bengaluru has 6250 users, growing at 20% per year (compounded annually).…Look at the table for a deposit of ₹ 8,000 at 10% per annum, compounded annually. What…