Question

A sum of money becomes 6 times of itself at simple interest in 25 years, how long would it take for
same amount to become double
​

Answer 1

Step-by-step explanation:

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7th

Maths

Comparing Quantities

Simple Interest

A certain sum of money beco...

MATHS

A certain sum of money becomes three times of itself in 20 years at simple interest. In how many years does it become double of itself at the same rate?

MEDIUM

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ANSWER

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:

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.

Step-by-step explanation: