The insurance provider covers 80% of the $4,400 expense: 0.8*4400 = $3520
Consequently, Marge's payment amounts to 4400 - 3520 = $880
However, noting that $4400 is the total for annual group insurance, to determine her monthly payment, we divide her yearly cost by 12: 880/12 = $73.33 (rounded to two decimal places)