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b. A sum of money trebles itself in 6 years at a certain
rate of interest. In how many years will it become
four times itself at the same rate of interest
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Answer:
Int=2p. , N = 6 yrs, R =?
Rate=100xI/PN
= 100x2P/px6=200/6=100/3
= 33 1/3%
Int=3P, R = 100/3%, N=?
N= 100xI/PR
= 100x3px3/px 100 = 9 yrs
Ans=9yrs
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