Luke borrows $800 000 from a bank to set up a medical practice. He agrees to pay a fixed interest rate of 10.2% pa (calculated monthly) and to repay by equal monthly instalments over 10 years. Calculate the monthly repayment. By how much does Luke's first repayment reduce the principal? If the loan is paid off as planned, by how much will the last repayment reduce the principal?

Could you especially explain the last question clearly?