Night Shades Inc. (NSI) manufactures biotech sunglasses. The variable materials cost is $5.43 per unit, and the variable labor cost is $3.13 per unit. 

a. What is the variable cost per unit?
b. Suppose NSI incurs fixed costs of $720,000 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 $19.99 per unit, does NSI break even on a cash basis? If depreciation is $220,000 per year, what is the accounting break-even point?