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 $ 22,400 Variable expenses Contribution margin 12,800 9,600 Fixed expenses. 7,968 Net operating income $ 1,632 Required: How many units must be sold to achieve a target profit of $5,616? (Do not round intermediate calculations.) Number of units