Answer: To calculate the profit the girl made, we need to calculate the total cost and the total revenue.
The cost of the lemonade mix, cups, and the pitcher is:
$12 + $9 + $4 = $25
The number of pitchers needed to serve 107 cups of lemonade is:
107 cups ÷ 8 cups per pitcher = 13.375 pitchers (round up to 14 pitchers)
The cost per cup of lemonade is:
Total cost / Total cups = $25 / 500 cups = $0.05 per cup
The revenue from selling 107 cups of lemonade at $0.50 per cup is:
107 cups x $0.50 per cup = $53.50
The profit is the revenue minus the cost:
Profit = $53.50 - $25 = $28.50
Therefore, the girl made a profit of $28.50 from her lemonade stand that day.
Explanation: