Please help me answer the incorrect questions

Delta Company produces a single product. The cost of producing and selling a single unit of this product at the company's normal activity level of 93, 600 units per year is: The normal selling price is $19 per unit. The company's capacity is 106.800 units per year An order has been received from a mail-order house for 1, 100 units at a special price of $16.00 per unit. This order would not affect regular sales. If the order is accepted, by how much will annual profits be increased or decreased? (The order will not change the company's total fixed costs.) Assume the company has 500 units of this product left over from last year that are inferior to the model. The units must be sold through regular channels at reduced prices What unit cost is relevant for establishing a minimum selling price for these units