$16097.57
Explanation:Amount borrowed = P = $8000
rate = r = 12% = 0.12
n = number of times compounded = semi-annually
n = 2
time = t = 6 years
Let the amount he owes after 6 years = FV
Using compound interest formula:
[tex]FV\text{ = P(1 +}\frac{r}{n})^{nt}[/tex][tex]\begin{gathered} FV\text{ = 8000(1 + }\frac{0.12}{2})^{2\times6} \\ FV\text{ = 8000(1 + }0.06)^{12} \\ FV\text{ = 8000(1}.06)^{12} \\ FV\text{ = 8000(}2.01219647184) \\ FV\text{ = }16097.5718 \end{gathered}[/tex]To the nearest cent, the amount owed is $16097.57