Answer:
a. Variable cost per unit:
= (Sales - Fixed costs - Operating income) / number of units sold
= ((14,000 units * 240) - 168,000 - 1,176,000) / 14,000
= 2,016,000 / 14,000
= $144 per unit
b. Unit contribution margin:
= Selling price - Variable cost per unit
= 240 - 144
= $96
c. Contribution margin ratio:
= Unit contribution margin / Selling price
= 96 / 240
= 40%