Question

A woman deposited a sum of money in the bank at 10% per annum simple interest. How long will it take the money to double?

Answer 1

Let the money be p and let it take n years for the money to double.

Now,  

Interest= Amount-Principle= 2p-p=p

ATP,

p*10*n/100= p

n/10=1

n=10

Thus time required is 10 years...

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