Loan 3: 15-year versus 30-year mortgage

Amortize a mortgage for a $225,000 house with a 20% down payment for both a 15-year mortgage at 3.625% and a 30-year mortgage at 4.125%.

• 15-year mortgage monthly payment?
• What is the total interest cost over the life of the 15-year loan?
• 30-year mortgage monthly payment?
• What is the total interest cost over the life of the 30-year loan?
• Difference in interest costs between a 15-year and a 30-year mortgage?