Question

26. In 10 years a certain sum doubles itself. Find the rate per cent per annum. ​

Answer 1

Answer:

Hence the required rate in which the sum becomes double itself in 10 years is 10%.

Answer 2

Since sum double itself in 10 years, so sum = S.I. for 10 years.

Let sum =x. Then, S.I. =x and Time =10 years.

∴Rate=(x×10100×x)% =10%

Now, sum =x, S.I. =2x, Rate =10%

∴ Time =(x×10100×2x)years=20 years.

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