A factory purchases raw materials. The standard unit price is c1. The supplier offers a discounted price c2 (c2 < c1) if the factory orders a quantity greater than a threshold h. The supply chain manager calculates the standard Economic Order Quantity (Q) using price c1 and finds that Q < h

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To minimize total costs, the manager must evaluate a specific point "a". What does point "a" mathematically represent in the context of the cost functions