A sum of money becomes double in 10years at a certain rate of interest . Find the rate of interest .
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Step-by-step explanation:
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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