Grace Harp Instruments Co. has monthly demand and sales of 125 units: Variable Production Costs: Assume that Grace Harp was evaluating whether it should accept a special sales order for 10 units at \\( \\$ 340 \\) per unit. For this purpose, the total relevant cost per unit (given the costs stated above) is: \\( \\$ 260 \\) \\( \\$ 288 \\) \\( \\$ 354 \\) \\( \\$ 406 \\)