Healthier Living Company manufactures two products-toaster ovens and bread machines. The following data are available Bread Machines 160 $70 Toaster Ovens Sales price $120 Variable costs $60 Healthier Living can manufacture six toaster ovens per machine hour and four bread machines per machine hour. Healthier Living's production capacity is 2,000 machine hours per month. What is the contribution margin per machine hour for bread machines? Select one: O A. $90 O B. $540 C. 5360 D. $60