Lie Around Furniture manufactures two products: Couches and Beds. The following data are available: Sales price Variable costs Couches $520 $390 Beds $720 $405 The company can manufacture either 4 couches per machine hour or 2 beds per machine hour. The company's production capacity is 10,100 machine hours per month. What is the contribution margin per machine hour for couches? O A. $520 OB. $3,640 OC. $780 OD. $130