What is the least number of complete years in which a sum of money put out at 40 annual compound int...........

Quantitative Aptitude (CDS) Compound Interest

What is the least number of complete years in which a sum of money put out at 40% annual compound interest will be more than trebled?

A = P(1+R/100)^t
3P < P(1+40/100)^t
3 < (1.4)^t
When t = 3 ; 1.4³ = 2.744 And when t = 4; 1.4⁴ = 3.8416 T=4 is the answer

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