Question 185701
algebra problem? 
4100 = 100*((1+X)^20 -1)/X 
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Using Google and search string "present value equation"
I found the following:

i = [FV/PV]^(1/n) -1

i = [4100/100]^(1/20) -1

i = [41]^(1/20) -1 

i = 1.20 -1

i = 0.20 or 20%
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Cheers,
Stan H.