Question 625920
the formula is fv=pv(1+r)^t 
If my fv=1105 pv=250 interest is 8% what is t(number of years)
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1105 = 250*(1.08)^t
You didn't spec the compounding period, I'll use yearly
1105 = 250*(1.08)^t
1.08^t - 1105/250 = 4.42
t*log(1.08) = log(4.42)
t = log(4.42)/log(1.08)
t =~ 19.31 years