Hi,

5000 dollars is invested at 4% apr with interest compounded semiannually 

how long before the money doubles?

Note:  In General: 

A = Accumulated Amount 

P= principal 

r= annual rate = .04

m= periods per year = 2

t= years 

 

A/P = 2  (doubling the money)





 t = 17.5 yrs 

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