rigoberto invests 8,000 at 6% interest, compound semiannually for 1 year

You can solve using the compound interest formula:

Fv = Pv * (1+i)^n
Fv=future value, to be calculated
Pv=Present value ($8000)
i=interest per period (6%/2=0.03)
n=number of periods (2)