A borrower took out a $30-$year fixed$-$rate mortgage of $$2,250,000$ at a $7\mathrm{.}2$ percent annual rate. After five years, he wishes to pay off the remaining balance. Interest rates have fallen to $7$ percent. How much must he pay to retire the mortgage $($to the nearest dollar$)?$ Hint: it may be easier to use the EXCEL function CUMPRINC to get how much principal has been paid in the five years. $($You need to show the steps$)$