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a) Cost is the total of fixed costs and variable (per unit of product) costs. Of course, the per-unit costs are multiplied by the number of units to determine their total amount.C(x) = 18,000 +20xb) Revenue comes from selling the product. It is the sale price of each product multiplied by the number of products sold.R(x) = 80xc) The break-even point is that point where revenue and cost are equal. That is, revenue from product sales just covers all the costs of producing that product.R(x) = C(x)80x = 18,000 +20x60x = 18000x = 18000/60 = 300The company will break even when it produces and sells 300 canoes....