Question

in how much time will a sum of money double itself if invested at 8 % simple interest per annum ?



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Answer 1

According to your question—

Principal= P

Amount = 2P

Simple Interest= Amount - Principal

= 2P - P

P

Simple Interest = Principal

100=100[given]

Time = SI×Amount/ principal× Rate

= 100× P×100/ 100×8

25/4years...

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This is the Correct Answer.....

Answer 2

Let sum of money=Rs. x

Therefore amount=Rs. 2x

Interest=sum*time*R/100

=x*time*8/100

=8x*time/100

Amount=sum+interest

2x=x+8x*time/100

2x=100x+8x*time/100

200x=100x+8x*time

100x=8x*time

time=100x

time=12.5years.

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