Amir has obtained a $250,000 mortgage. The mortgage is amortized over 25 years and the term of the mortgage is 25 years. The mortgage interest rate is 9% compounded annually. Amir will begin making annual payments of $25,451.56 at the end of the year. What is the principal outstanding immediately after Amir makes his third payment?
a.$50,903.12
b.$173,645.32
c.$185,574.60
d. $240,324.46