Pierce Phones is considering the introduction of a new model of headphone whose selling price is $10 per unit and whose variable expense is $7 per unit. The company's monthly fixed expense is $4,200. Required: 1. Calculate the company's break-even point in unit sales. 2. Calculate the company's break-even point in dollar sales. (Do not round intermediate calculations.) 3. If the company's fixed expenses increase by $600, what would become the new break-even point in unit sales? In dollar sales? (Do not round intermediate calculations.) baskets 1. Break-even point in unit sales 2. Break-even point in dollar sales 3. Break-even point in unit sales Break-even point in dollar sales baskets