Question

A sum of money becomes 6 times of itself at simple interest in 25 years. So how long would it take to be double?

Answer 1

Let the principal =Rs.x. Amount =Rs.3x, Time =20 years

∴S.I.=Rs.3x−Rs.x=Rs.2x

Rate =( x×20

2x×100

)%p.a.=10%p.a.

Now, Principal =Rs.x, Amount =Rs.2x, Rate =10%p.a.

S.I.=Rs.2x−Rs.x=Rs.x

∴ Time =

x×10

x×100

=10 years.

Answer 2

Answer:

5 years

Step-by-step explanation:

A sum of money becomes 6 times of itself at simple interest in 25 years

Interest in 25 years: sum+x=6*sum => x= 5*sum= 500%

500% interest in 25 years

500%/25= 20% interest in 1 year

100% interest will double the sum in: 100%/20= 5 years

So answer is 5 years to get the sum to double up

Step-by-step explanation:

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