Can someone explain how you get the answers aswell, ive done this before but this is really tripping me up

E6-6 Inferring Missing Amounts Based on Income Statement Relationships [LO 6- 2, LO 6-5] Gross Profit Cost of Sales Beginning Goods Purchases Revenue Inventory Available for Sale $700 $100 $800 l aro 900 200 800 Cost of Cost of Goods Ending Sold Inventory $300 600 150 200 300 650 250 300 A B B WOO 100 400 D 800 600 mo E 1,000 50 900 500