E6-24A Use unit cost data to forecast total costs (Learning Objective 2) Delivery Mailbox produces decorative mailboxes. The company's average cost per unit is $20.43 when it produces 1,000 mailboxes. Requirements 1. What is the total cost of producing 1,000 mailboxes? 2. If $10,430 of the total costs is fixed, what is the variable cost of producing each mailbox? 3. Write Delivery Mailbox's cost equation. 4 tthe plant manager uses the average cost per uni to predict total costs, what would the forecast be for 1,100 mailboxes? 5. If t he plant manager uses the cost equation to predict total costs, what would the forecast be for 1,100 mailboxes? 6. What is th e dollar difference between your answers to questions 4 and 5? Which approach to forecasting costs is appropriate? Why