[The following information applies to the questions displayed below] Oslo Company prepared the following contribution format income statement based on a sales volume of 1,000 units (the relevant range of production is 500 units to 1,500 units): Sales Variable expenses Contribution margin Fixed expenses Operating income Required: 1. What is the contribution margin per unit? Contribution margin per unit $ 20,000 12,000 8,000 6,000 $ 2,000