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UPSC CDS Math Simple and Compound Interest Questions
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© examsnet.com
Question : 3
Total: 19
What is the least number of complete years in which a sum of money put out at 40% annual compound interest will be more than trebled ?
[2019 CDS-I]
3
4
5
6
Validate
Solution:
Let P be the sum invested for n years.
Then,
P
(
14
)
n
>
3
P
⇒
(
1.4
)
n
>
3
⇒ When n = 4, amount is 3.8 times the principle
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