Create an application that calculates and displays four monthly mortgage payments. The application should use the loan amount and annual interest rate provided by the user, along with terms of 15 years, 20 years, 25 years, and 30 years. Use a combo box to get the annual interest rate, which should range from 2% through 8% in increments of 0.5%. The application should also display the total amount paid at the end of 15 years, 20 years, 25 years, and 30 years.