1. A grocery store adopts the weighted average cost method for inventory valuation. During the month of June, the store makes the following transactions:
   1. Beginning inventory: 1,000 units at $2 per unit.
   2. Purchases:
      1. 2,000 units at $2.50 per unit.
      2. 1,500 units at $3 per unit.
   3. Sales: 3,500 units.
   4. Calculate the cost of goods sold and ending inventory for June using the weighted average cost method.