The units of headphones that must be sold to have an operating profit of $159,500 is 3497.
Operating profit is total profit that is earned from the daily business operations of a business. Operating profit is total revenue less fixed cost and variable cost.
How many units must be sold to have an operating profit of $159,500 = operating profit + fixed cost / (selling price - variable cost)
(159,000 + $348,000) / (285 - 140) = 3497
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