Waterway Company's inventory records show the following data: Units Unit Cost Inventory: January 1 10000 $8.80 Purchases: June 18 9500 9.00 November 8 5500 7.00 -/1 : A physical inventory on December 31 shows 4300 units on hand. Waterway sells the units for $14 each. The company has an effective tax rate of 22%. Waterway uses the periodic inventory method. The weighted-average cost per unit is $8.18, O $8.33. O $8.78. $8.48.