Question 891583
How long doyou need to wait to have a total of $2000 if you invest $1600 at 5% intrest? 
.
Assuming "simple interest", we can use:
A = P(1+r)^t
where
A is 2000
P is 1600
i is .05
t is what we're looking for.
.
2000 = 1600(1+.05)^t
2000/1600 = (1.05)^t
1.25 = (1.05)^t
{{{log(1.05,1.25)}}} = t
4.57 years = t