Answer:
$71,520
Explanation:
we must first determine the monthly payment:
monthly payment = present value / annuity factor
monthly payment = $608,000 / 128.46 = $4,732.99
Then I prepared an amortization schedule using an excel spreadsheet. After the 18th payment, the principal balance is $596,005.
The investor will have $667,525 - $596,005 = $71,520