1.

A sum of money triples itself in 3 years at compound interest. In how many years will it become 9 times itself ?A. 4B. 9C. 6D. 7

Answer» Correct Answer - C
(i) Use formula for amount and then use laws of indices,
(ii) Let `3P=P(1+(R )/(100))^(3)` find R.
(iii) Let `9P=P(1+(R )/(100))^(n)`, find n.


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