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Rs 1000 is invested at 5% per annum s...

Rs 1000 is invested at 5% per annum simple interest. If the interest is added to the principal after every 10 years, the amount will become Rs 2000 after (a) 15 years (b) `16 2/3` years (c) 18 years (d) `20` years

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RS AGGARWAL-SIMPLE INTEREST-All Questions
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  14. The simple interest at x % for x years will be Rs x on a sum of ...

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  15. In 4 years, Rs 6000 amounts to Rs 8000. In what time at the same ra...

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  16. Rs 6200 amounts to Rs 9176 in 4 years at simple interest. If the in...

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  18. A certain amount earns simple interest of Rs 1750 after 7 years. Ha...

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