The marketing manager of Franklin Corporation has determined that a market exists for a telephone with a sales price of $21 per unit. The production manager estimates the annual fixed costs of producing between 42,000 and 81,300 telephones would be $604,600. Required Assume that Franklin desires to earn a $133,000 profit from the phone sales. How much can Franklin afford to spend on variable cost per unit if production and sales equal 46,100 phones