A new employee charged $6840 on his credit card to relocate for his first job. After noticing that the interest rate for h balance was 27% compounded monthly, he stopped charging on that account. He wishes to pay off his balance in 2 years using automatic payments sent at the end of each month. a. What monthly payment must he make to pay off the account at the end of 2 years? b. How much total interest will he have paid? a. What monthly payment must he make to pay off the account at the end of 2 years? $ (Round to the nearest cent as needed.)