Hi I'm trying to do a financial management assignment and i'm having trouble getting the correct answer, even trying some sample questions with the solutions, but maybe i'm using my calculator wrong. Im so frustrated!

Five years ago, Marcus bought a house. He secured a mortgage

from his bank for

$490,000

. The mortgage had monthly

payments for 20 years with an interest rate of 6.0% compounded monthly. However, after five years, it is time to renegotiate the mortgage. Interest rates have fallen to 4.5% compounded monthly, and Marcus still intends to make monthly payments and to pay back the debt over the remaining 15 years.

a)	How much were Marcus' initial monthly payments? (1 mark)
b)	What is the outstanding principal on his mortgage? (1 mark)
c)	How much are Marcus' new monthly payments? (1 marks)