#### Explanation:

$A = R \cdot \frac{{\left(1 + \frac{r}{n}\right)}^{n t} - 1}{\frac{r}{n}}$ is the annuity formula, which is what you'd use for regular payments being made over the course of time

r=0.06 (r is the interest rate as decimal)
R=$758 (R stands for the monthly payment) n=12 because 12 payments per year t = 7 for 7 years $A = 758 \cdot \frac{{\left(1 + \frac{.06}{12}\right)}^{12 \cdot 7} - 1}{\frac{.06}{12}}$A=758[(.5204]/(.005)]=$78,892.54