Question 610123
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Hi, 
In General for Cases where Interest compounds Contiuosly {{{A = Pe^rt}}}
A = Accumulated Amount $15000
P= principal = $5000
r= annual rate = .025
t= years = 
{{{15000 = 5000e^(.025t)}}}
{{{3 = e^(.025t)}}}
 ln3/.025 = t = 43.9 yrs