Question

An amount becomes 7 times in 15 years. In how many years will the same amount become 10 times? The rate of interest remains the same for both cases. *
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Answer 1

Given :- An amount becomes 7 times in 15 years. In how many years will the same amount become 10 times ? The rate of interest is at simple interest remains the same for both cases. ?

Solution :-

we know that, when rate is at simple interest, then,

• (number of times1 - 1)/(Time1) = (Number of times2 - 1) /Time2

we have,

• Times1 = 7
• Time1 = 15
• Times2 = 10
• Time2 = Let x years.

Putting all values , we get,

→ (7 - 1)/15 = (10 - 1)/x

→ 6/15 = 9/x

→ 6x = 15 * 9

→ x = (135/6)

→ x = 22.5 years.

Therefore, at same Simple interest rate, amount will be 10 times in 22.5 years.

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