Farrington Door Accessories manufactures a variety of metal knobs, latches, hinges and other security- related accessories for doors. Their expected unit sales and cost data for the year 2021 is shown here: Plain knob Sales price / unit Variable costs / unit Contribution margin / unit Sales mix Hinge sets $ 15 13 $ 2 40% $ 10 8 $ 2 30% Locking knob $20 15 $ 5 20% Knob with deadbolt $ 35 21 $ 14 10% Farrington expects their total fixed costs to be $68,400 in 2021. REQUIRED: 1. Calculate Farrington's break-even point in units for the whole company. 2. Calculate Farrington's break-even point in units for each of their products. 3. Demonstrate that the sales quantities you found for each product in #2 will actually generate an overall net income of zero for Farrington