Mauro Products distributes a single product, a woven basket whose selling price is $15 and whose variable expense is $12 per unit. The companys monthly fixed expense is $4,200. 1. Solve for the companys break-even point in unit sales using the equation method. 2. Solve for the companys break-even point in sales dollars using the equation method and the CM ratio. 3. Solve for the companys break-even point in unit sales using the formula method. 4. Solve for the companys break-even point in sales dollars using the formula method and the CM ratio.