Use the formula A = P*(1+r*t) where in this case
A = 10,000
P = 8,000
r = 0.0625
and solve for t
A = P*(1+r*t)
10000 = 8000*(1+0.0625*t)
10000/8000 = 1+0.0625*t
1.25 = 1+0.0625*t
1.25 - 1 = 0.0625*t
0.25 = 0.0625*t
0.0625*t = 0.25
t = 0.25/0.0625
t = 4
It will take 4 years
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