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Question

At what rate of interest per annum will a sum becomes 5 times in 20 years at S.I.?

A
10%
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B
16%
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C
20%
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D
25%
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Solution

The correct option is B 20%
Interest earned =P×r×t
P= Principal amount
r= Rate of interest
t= Time period

Here, sum becomes 5 times in 20 years,
Interest earned 4 times the principal amount.

4P=P×r×20
r=420×100=20%

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