Question 606651
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Hi,
5000 dollars is invested at 4% apr with interest compounded semiannually 
how long before the money doubles?
Note:  In General: {{{A = P(1+r/m)^mt}}}
A = Accumulated Amount 
P= principal 
r= annual rate = .04
m= periods per year = 2
t= years 
 {{{A/P =(1+r/m)^mt}}}
A/P = 2  (doubling the money)
{{{2=(1+.04/2)^(2t)}}}
{{{ln(2) /2ln(1.02) = t}}}
 t = 17.5 yrs