The marketing manager of Vernon Corporation has determined that a market exists for a telephone with a sales price of $20 per unit. The production manager estimates the annual fixed costs of producing between 40,200 and 80,800 telephones would be $536,800. Required Assume that Vernon desires to earn a $117,000 profit from the phone sales. How much can Vernon afford to spend on variable cost per unit if production and sales equal 46,700 phones