Answer:
$1017.014 is the answer.
Explanation:
Principle amount = $115000
Per month payment is = $658.95 per month
Amount still owed after 17 years(25-8=17) = $52,442.26
Prepayment fee = (0.8*52,442.26)*(1.004^6 - 1) = $1017.014
Hence, Charlene will pay a prepayment fee of $1017.014 for paying off her loan 8 years early.