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A certain sum becomes 3 times itself in 4 years at compound interest. In how many years does it become 27 times itself ?A. 15 yearsB. 12 yearsC. 36 yearsD. 21 years |
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Answer» Correct Answer - B (i) Use formula for amount. (ii) If `3P=P(1+(R )/(100))^(4)`, then find R. (iii) If `27P=P(1+(R )/(100))^(n)`, then find n. |
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