Question

A sum of money becomes three times of itself in 10 years. In how many years will it become 10 times of itself?
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Answer 1

ANSWER

sum of money becomes 3 times of itself =10 years

sum of money becomes 1 time of itself = 10÷3

=3.90

sum of money becomes 10 times of itself= 3.9

×10 =39/10×10

=39 years answer

Answer 2

Let the principal be Rs 100

Amount=3×100=300

Time=10 years

Simple interest=300–100=200

Rate= 200×100/100×10=20%

Now Amount= 100×10=Rs1000

Principal Rs100

Simple interest=Rs(1000–100)=Rs900

Rate=20%

Time=900×100/100×20=90 years.

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