Valdez Corporation has provided the following contribution format income statement. Assume that the following information is within the relevant range. Sales (6,000 units) $240,000 Variable expenses 180,000 Contribution margin 60,000 Fixed expenses 54,000 Net operating income $ 6,000 The number of units that must be sold to achieve a target profit of $24,000 is closest to: O 7,800 units O 13,800 units O 24,000 units 30,000 units