What will be the ratio of simple interest earned by certain amount at the same rate of interest for 12 yr and for 18 yr?

2 : 5
1 : 3
2 : 3
3 : 1

Correct Answer: 2 : 3

Explanation:

If the principal = P and interest = R%
Then, required ratio = [(P x R x 12)/100] / [(P x R x 18)/100]
= 12 / 18
= 2/3
= 2 : 3

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