The marketing manager of Durant Corporation has determined that a market exists for a telephone with a sales price of $30 per unit. The production manager estimates the annual fixed costs of producing between 40,000 and 80,000 telephones would be $450,000. Assume that Durant desires to earn a $165,000 profit from the phone sales. How much can Durant afford to spend on variable cost per unit if production and sales equal 50,000 phones? (Round your answer to 2 decimal places.) Variable cost per unit