The following estimates of costs and expenses have been made for XYZ Corporation: Production/Sales 30,000 units Mixed Costs $ 90,000 10,000 units Required: 1. Variable costs per unit. 2. Fixed portion of costs and expenses 3. 4. Amount of Fixed expenses per unit under: a. 30,000 units b. 10,000 units Estimated mixed costs for: a. 18,000 units b. 25,000 units 50,000