Night Shades, Inc. ( NSI), manufactures biotech sunglasses. The variable materials cost is $ 10.48 per unit, and the variable labor cost is $ 6.89 per unit. a. What is the variable cost per unit? b. Suppose NSI incurs fixed costs of $ 870,000 during a year in which total production is 280,000 units. What are the total costs for the year? c. If the selling price is $ 49.99 per unit, does NSI break even on a cash basis? If depreciation is $ 490,000 per year, what is the accounting break- even point?