A manufacturing company consider buying a new machine. The machine A has a fixed cost of $10,000 and a variable cost of $10 per unit. The machine B has a fixed cost of $20,000 and a variable cost of $8 per unit. The machine C has a fixed cost of $30,000 and a variable cost of $5 per unit. Their product is sold at $15 per unit. Pease identify at what demand range the machine A is best option. Plot the graph as well