The marketing manager of Zachary Corporation has determined that a market exists for a telephone with a sales price of $22 per unit. The production manager estimates the annual fixed costs of producing between 41,300 and 80,700 telephones would be $346,000. Required Assume that Zachary desires to earn a $128,000 profit from the phone sales. How much can Zachary afford to spend on variable cost per unit if production and sales equal 47,400 phones