8- A manufacturing firm produces a product whose selling price is 45 000 $ per unit and the variable costs per unit are 20 000 $. If the annual fixed costs of the firm are estimated as 250 000 $. Find the breakeven point in units. Determine the profit or loss in dollars if the firm has an estimated quantity of 4000 units of the product. 9-Derive the relation to determine the breakeven quantity QBE? 10-Describe the various relations between total revenue and total cost to determine QBE