Benjamin Company incurred the following unit manufacturing costs for the product: Direct materials Direct labor Variable overhead Fixed overhead $10 3 2 4 Benjamin uses 150,000 units per year. Brazel Company has offered to sell Benjamin 150,000 units per year for $18. Fixed overhead is unavoidable. Should Benjamin make or buy the part? It should make the part because it will save $450,000 over buying it. It should make the part because it will save $150,000 over buying it. It should buy the part because it will save $450,000 over making it. It should buy the part because it will save $150,000 over making it