On a snowy day, the amount of money Billy earns, M, varies directly with the number of driveways that he shovels, D. When he shovels 7 driveways, he earns $80.50. How much does he earn if he shovels 13 driveways?
(1 point)
Responses
$149.50
$149.50
$11.50
$11.50
$161.00
$161.00
$113.00