Answer:
She will produce four tons at a total cost of $5,000
Step-by-step explanation:
For each additional ton of coffee produced the marginal cost is increase by $500. This means that when Sarah reaches the fourth ton of coffee the cost of producing the ton of coffee would be $2,000.
At this point she is neither making any profit nor any loss. So, this would be her maximum limit of producing the ton of coffee.
The total cost of producing the four tons of coffee would be $5,000 ($500 for first + $1,000 for second + $1,500 for third + $2,000 for fourth).