please answer all required parts

Dunbar Door Accessories manufactures a variety of metal knobs, latches, hinges and other security- related accessories for doors. Their unit sales and cost data for the year 2020 is shovin here: Hinge sets $ 15 Sales price / unit Variable costs / unit Contribution margin / unit Sales mix Knob with deadbolt $ 35 21 $ 14 10% Plain knob Locking knob $ 10 $20 8 15 $ 21 30% 20% 13 S2 40% 5 Dunbar expects their total fixed costs to be $68,400 in 2020. REQUIRED: 1. Calculate Dunbar's break-even point in units for the whole company. 2. Calculate Dunbar'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 Dunbar