MagiPost produces decorative mailboxes. When it produces 1,000 mailboxes, the companys average cost per unit is $24.56. a. What is the total cost of producing 1,000 mailboxes? b. If $18,000 of the total costs are fixed, what is the variable cost of producing each mailbox? c. Write MagiPosts cost equation. d. If the plant manager uses the average cost per unit to predict total costs, what would the forecast be for 1,200 mailboxes? e. If the plant manager uses the cost equation to predict total costs, what would the forecast be for 1,200 mailboxes