Which of the following costs are mixed costs? Cost 10,000 Units 30,000 Units $ 100,000 $300,000 $140,000 $240,000 $90,000 $90,000 4. $50,000 $150,000 O only 2 none of these O only 1 1 and 4 1 and 2 Which of the following costs are variable costs? Cast 10.000 Units 30,000 Units $100,000 $300,000 $240,000 $140,000 $90,000 $90,000 $50,000 $150,000 O only 1 O1 and 4 0 1 and 2 O only a O none of these