Southron Inc. produces a specific appliance, the flexible (variable) cost per unit is $15. Fixed cost is $250,000 per month. The appliance is sold to retailers for $25 each, on average. Southron Inc. is considering giving a $5 discount on all units sold in January. It is expected that the discount will increase sales from 40,000 units to 50,000 units. The effect on operating profit will be Select one a. an increase of $ 50,000 b. an increase of $100,000 O c. a decrease of $100,000 O d. a decrease of $150,000