why do i multiply 72,500 by 13.67 and not by 16.67?? 16.67 is the manufacturing per unit under absorption costing.

(6) Absurption income statement Big Sports manufacturing had an ending inventory of 85,000 basketballs in 2020 . For these units, the fixed manufacturing overhead cost was $4.00 per unit and the variable manufacturing cost was $9.67 per unit. In 2021 , the company produced 35,000 basketballs, sold 72,500 basketballs, and had an inventory of 47,500 units. Basketballs sold for $18 each during the year. Big Sports uses the FIFO method in accounting for its inventory. Instructions: 1) Calculate Big Sports manufacturing cost per unit under a variable costing system. 2) Prepare a variable costing income statement for 2021. 3) Calculate Big Sports manufacturing cost per unit under a throughput costing system. 4) Prepare a throughput costing income statement for 2021. Assume that increased costs ir 2021 are related to variable costs other than materials. 5) Calculate Big Sports manufacturing cost per unit under absorption costing for 2021. 6) Prepare an absorption costing income statement for 2021