Exercise 3-4A (Algo) Determining variable cost from incomplete cost data LO 3-1 Thornton Corporation produced 213,000 watches that it sold for $18 each during year 2 . The company determined that fixed manufacturing cost per unit was $8 per watch. The company reported a $852,000 gross margin on its year 2 financial statements. Required Determine the variable cost per unit, the total variable cost, and the total contribution margin