E6-6 Yard Tools manufactures lawnmowers, weed-trimmers, and chainsaws. Its sales mix and contribution margin per unit are as follows. Sales Mix Contribution Margin per Unit Lawnmowers Weed-trimmers 20% $30 50% $20 Chainsaws 30% $40 Yard Tools has fixed costs of $4,200,000. Instructions Compute the number of units of each product that Yard Tools must sell in order to break even under this product mix.