Samuel purchased a house for $375,000. He made a down payment of 10.00% of the value of the house and received a mortgage for the rest of the amount at 6.32% compounded semi-annually amortized over 15 years. The interest rate was fixed for a 4 year period.

a. Calculate the monthly payment amount. Round to the nearest cent

b. Calculate the principal balance at the end of the 4 year term. Round to the nearest cent

c. Calculate the monthly payment amount if the mortgage was renewed for another 4 years at 6.22% compounded semi-annually? Round to the nearest cent