Longstreet Inc. has fixed operating costs of $600,000, variable costs of $3.00 per unit produced, and its product sells for $4.20 per unit. What is the company's break-even point, i.e., at what unit sales volume would income equal costs? a. 200,000 b. 142,857 c. 500,000 d. 171,429 e. 83,333