Answer:
$79,381
Explanation:
We can use the formula for compound growth to solve this. Thus,

Where
F is the future amount (the amount that must be paid back)
P is the initial amount (it is 46,000)
r is the annual rate of interest (here it is 6.25%, in decimal it is 0.0625)
t is the number of year (9 years, t = 9)
Putting them into the formula, we can solve for F, our answer:

Rounded to nearest dollar, $79,381