Is there more than one way to do this problem?

Mary Lib purchases a house for $450,000. She makes a down payment of $40,000 at the time of the purchase, and the balance is financed at 6.0% compounded monhly, with monthly payments made over a 10 -year period. a) What is the size of the monthly payments? b) If the loan period had been 20 years, what would have been the size of the monthly payments