A sum of money invested at compound interest doubles itself in 4 years interest being payable annually in how much time will it be eight times .
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It is given that the money placed at x% compound interest doubles in 4 years.
That means Rs.100 will become 200 after 4 years.
How much it will grow in 'another 4 years' ? At the end of 8 years, it will be
200 X 200% = 400
How much it will grow in ' another 4 years' ? At the end of 12 years, it will be
200 X 200% X 200% = 800
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