Question

A sum of money double itself in 10 years. find the rate of interest
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Answer 1

Answer:

Step-by-step Let the principal be x

Time = 10 years

Amount after 10 years gets doubled

So amount = 2x

simple interest = amount - principal

simple interest = 2x - x = x

Rate per annum = SI × 100 / P × T

= x × 100 / x × 10

100x/ 10x = 10

So rate per annum = 10%.

Hope my answer helps you

Answer 2

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A sum of money double itself in 10 years. find the rate of interest.......

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Let the principal be =x

Then,in 2 years the amount will be- x×2=2x

Now,interest= amount - principal=2x - x = 1x

Time= 10 year

Rate=?

Now, RATE= interest/principal×100/time

So, R=1X/X × 100/10

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