Don owns a small concrete-mixing company. His fixed cost is the cost of the concrete-batching machinery and his mixer trucks. His variable cost is the cost of the sand, gravel, and other inputs for...

Don owns a small concrete-mixing company. His fixed cost is

the cost of the concrete-batching machinery and his mixer

trucks. His variable cost is the cost of the sand, gravel, and other

inputs for producing concrete; the gas and maintenance for the

machinery and trucks; and his workers. He is trying to decide

how many mixer trucks to purchase. He has estimated the costs

shown in the accompanying table based on estimates of the

number of orders his company will receive per week.