Bradford Organization uses a periodic inventory system. Details for the inventory account for the month of January, 2019 are as follows: Units Per unit price Total Begin Inventory 1/1/19 200 $5.00 $1,000 Purchase 1/15/19 100 5.30 530 Purchase 1/28/19 100 5.50 550 Total 400 $2,080 I 7. What is cost of goods using weighted average? 8. Which costing method will result in the highest operating income and why