John Boyd Corporation manufactures and sells 1,000 tractors each month. The primary component in each tractor is the motor. John Boyd has the monthly capacity to produce 1,300 motors. The variable costs associated with manufacturing each motor are shown below: Direct materials $ 28 Direct labor $ 20 Variable manufacturing overhead $ 33 Fixed manufacturing overhead per month (for up to 1,300 units of production) averages $23,000. Joan Reid, Incorporated has offered to purchase 160 motors from John Boyd per month to be used in its own outboard motors. What is the incremental cost of producing each additional motor? Multiple Choice $48 per unit $81 per unit $104 per unit, or Some other amount