Can someone explain to me how to do these problems please and thanks

19.You have just taken a 30-year loan of $900,000 to buy a condo in Chicago. The loan's APR is 7.2%, and the payments are monthly. The first payment will be in one month. a. How much is the monthly mortgage payment? (2 points) b. How much is the interest payment and principal reduction (also known as principal payment) in your first mortgage payment? How much is the loan balance after your first payment? (3 points) c. How much is the loan balance right after your 100 'th mortgage payment? (3 points)