Your firm expects to earn $647,800 after taxes next year. Sales will be $3,600,000 and fixed costs will be $1,400,000. Interest expense will amount to $300,000. Your firm manufactures office machines, and expects to sell 9,000 units next year. Your firm has a 21% tax rate and the variable costs is $120 per unit. How many units would you have to sell to break even?