. Marc pays a flat rate of $40 per week to rent a motor boat. He pays an
additional $6 for every liter of fuel used. This week, Marc used 8 liters of fuel.
Marc wants to figure out what he will owe for his boat rental this week. The
first part of his calculation is shown below.
$6 x 8 = $48
What is Marc's next step for solving the problem?