Shannon purchased a machine for $28,500 for her company. She paid 5.00% of this amount as a down payment and financed the rest at 5.72% compounded monthly. She paid $1,125 at the end of every month to settle the loan.

a. What was the principal portion of payment number 4?

Round to the nearest cent

b. What was the interest portion of payment number 4?

Round to the nearest cent

c. Calculate the monthly payment amount if the mortgage was renewed for another 5 years at 4.12% compounded semi-annually?

Round to the nearest cent