Mathematics · Compound Interest
A sum of money invested at compound interest doubles itself in 9 years. In how many years will it become four times itself at the same rate of interest?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 127 years
- 218 years✓
- 39 years
- 413.5 years
Correct answer
18 years
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