Write a program to analyze a mortgage

Write a program to analyze a mortgage

The user should enter the amount of the loan, the annual percentage rate of interest, and the duration of the loan
in months. When the user clicks on the button, the information that was entered should be checked to make sure it is reasonable. If bad data have been
supplied, the user should be so advised. Otherwise, the monthly payment and the total amount of interest paid should be displayed. The formula for the
monthly payment is:

payment=p*r/(1-1+r)^(-n)),

where p is the amount of the loan, r is the monthly interest rate (annual rate divided by 12) given as a number between 0 (for 0 percent) and 1 (for 100
percent), and n is the duration of the loan in months. The formula for the total interest paid is:

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