Answer:
To calculate the unpaid balance after 9 months, we can use the formula for the remaining loan balance on an amortizing loan:
Unpaid Balance = Principal * (1 + Monthly Interest Rate)^Number of Payments - (Monthly Payment / Monthly Interest Rate) * ((1 + Monthly Interest Rate)^Number of Payments - 1)
Given the following information:
Principal (loan amount): $102,000.00
Monthly interest rate: 5.1% compounded monthly
Number of payments made: 9 months
Monthly payment amount: $553.81
Using the above formula, the unpaid balance after 9 months would be approximately $100,501.40.