The total amount of half gallons bought is 90.
How many half gallons were bought?
The profit is total revenue less total cost.
Profit = total revenue - total cost
- Total revenue = total half gallons sold x selling price
- Total cost = total half gallons bought x cost price
($3.98 x b) - $2.30(15 + b) = 91.50
Where b represents the half gallons sold
$3.98b - 34.50 - $2.30b = 91.50
$3.98b - $2.30b = $91.50 + $34.50
$126 = $1.68b
b = $126 / 1.68
b = 75
Total half gallons bought = 75 + 15 = 90
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