After time, t years it is = 3x, then,

3x = x(1 +2.5/100)^t = x(1.025)^t

(1.025)^t = 3

Taking log both sides, we get,

t = log(3) / log(1.025) = 0.477 / 0.0107

t = 44.492 years >======================< ANSWR

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