Kitchen Convenience Company manufactures two productstoaster ovens and bread machines. The following data are available: Toaster Ovens Bread Machines Sales price $100 $160 Variable costs $60 $50 Kitchen Convenience can manufacture six toaster ovens per machine hour and four bread machines per machine hour. Kitchen Convenience's production capacity is 1,800 machine hours per month. What is the contribution margin per machine hour for bread machines? O A. $440 OB. $660 O C. $110 OD. $40