Christina just purchased a small four-unit apartment building for $600,000. She financed it with a mortgage loan equal to 75% of the purchase price and paid the equity balance with cash she received from an inheritance. Interest on the mortgage loan was charged at 7.3% per annum compounded semi-annually and was to be repaid in equal monthly payments over a 25 year amortization period. The mortgage loan was for an initial term of 5 years at the end of which time it could be renewed at the interest rate prevailing at that time. The mortgage also included a prepayment provision that gave Christina the option to pay a lump sum equal to a maximum of 15% of the initial loan principal on each anniversary date, if she chose to.

What monthly payment will Christina have to make to service the mortgage loan?

to solve the problem do I need to care about the 75% of the purchase price. All I know in this problem is that i: 7.3/2 = 3.65% n: (25)(12) PV 600,000 how about when it says mortgage loan was for an initial term of 5 years at the end