Last year, Silver Company's total variable production costs were $7,500, and its total fixed manufacturing overhead costs were $4,500. The company produced 3,000 units during the year and sold 2,400 units. There were no units in the beginning inventory. Which of the following statements is true?

• Under variable costing, the average cost of the units in the ending inventory will be $4 each.

• The operating income under absorption costing for the year will be $900 lower than the operating income under variable costing.

• The ending inventory under variable costing will be $900 lower than the ending inventory under absorption costing.

• Under absorption costing, the average cost of the units in ending inventory will be $2.50 each.