6. (30 points) During the first year of operations, 9,000 units were muanufactured and 6,750 units were sold. On March 31, Carter Company prepared the following income statement based on the variable costing concept: Carter Company Variable Costing Income Statement For Year Ended March 31, 2018 Required: a. What is the inventory cost per unit based on the variable costing concept? b. What is the inventory eost per unit based on the absorption costing concept? c. What is the selling price per unit? d. What is the contribution margin per unit? c.. Prepare an absorption costing income statement