To help pay for culinary school, Donna borrowed money from her credit union. She took out a personal, amortized loan for $52,500 , at an interest rate of 5.15% , with monthly payments for a term of 20 years.

1.) Find Donna's monthly payment.

2.) If Donna pays the monthly payment each month for the full term, find her total amount to repay the loan.

3.)If Donna pays the monthly payment each month for the full term, find the total amount of interest she will pay.