Devin purchased a house for $500,000. He made a downpayment of 20% of the value of the house and received a mortgage for the rest of the amount at 6.25% compounded semi-annually for 25 years. The interest rate was fixed for a 5 -year term. a. Calculate the size of the monthly payments. Round to the nearest cent b. Calculate the principal balance at the end of the 5-year term