Please show your work for the cross-over chart and how to make the cross-over chart, because I do not know the steps for making the chart on excel. thank you!

Question 4. A firm is considering three location alternatives. At location A, fixed costs would be $4,000,000 per year, and the variable cost of shipping equals $0.30 per unit. At alternative B, fixed costs would be $3,600,000 per year, with variable costs of $0.35 per unit. At alternative C, fixed costs would be $3,000,000 per year, with variable costs of $0.40 per unit. Create a cross- over chart that shows the optimum location strategy over all possible level of units shipped