It will take an approximate of 52 years to triple the initial investment.
The formula for Future value is A = Pe^(rt)
Given Information
Triple amount
Rate = 2.1%
[tex]3 = e^(.0.021t)\\ln(3) = 0.021t\\t = ln(3)/0.021\\t = 1.09861228867 / 0.021\\t = 52.314870889\\t = 52.31[/tex]
Therefore, it will take an approximate of 52 years to triple the initial investment.
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