calculate minimum acceptable price per unit

A 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 41,000 units per monthis as follows:
Direct materials \$19.00
Direct labor \$ 6.90
Variable selling &administrative expense \$ 2.00
Fixed selling &administrative expense \$ 5.20
The normal selling price of the product is \$51.20 per unit.
An order has been received from an overseas customer for 2,100 units to be delivered this month at a special discounted price. This order would have no effect on thecompany's normal sales and would not change the total amount of the company's fixed costs. The variable selling and administrative expense would be \$0.20 less per uniton this order than on normal sales.
Direct labor is a variable cost in this company.
Suppose there is not enough idle capacity to produce all of the units for the overseas customer and accepting the special order would require cutting back onproduction of 210 units for regular customers. The minimum acceptable price per unit for the special order is closest to: \$30.40 or \$32.28 or \$51.20 or \$45.60