You sold 900 Units @ 100 per unit for a revenue of $90,000. Costs: Beginning Inventory 500 Units @ $50/unit. Purchases: 400 units @ $50/unit 100 units@ $65/unit 400 units@ $85/unit a. What is the value of your inventory and total purchases? b. What is the value of your ending inventory after the sales? c. What was the costs sales?