Answer:
$82.50
Explanation:
How many bottles can they fill up?
That would be total ounces (67.5) divide by number of ounces in each box (4.5). Thus,
Number of Bottles = 67.5/4.5 = 15
Each bottles sells for $5.50, so 15 bottles would be sold for:
5.5 * 15 = $82.5
Their earnings is $82.50