Answer:
$727.60
Step-by-step explanation:
total rental charge = total cost of renting the grass seed planter + cost of renting the tractor + usage tax
total cost of renting the grass seed planter = $17.50 x 20 = $35
cost of renting the tractor = 3 x $215 = $645
total cost of renting = $645 + $35 = $680
Usage tax = 7% x $680
0.07 x $680 = $47.6
total rental charge = $680 + $47.60 = $727.60