Variable and Absorption Costing

Pyne Company produces a single product. The company has 40,000 units in its ending inventory. Pyne's variable production costs during the year were $10 per unit and fixed manufacturing overhead costs were applied at $25 per unit ( which was the same as last year). The company's net operating income is $110,000 higher under variable costing than it is under absorption costing; and the company uses FIFO and closes any over- or under-applied overhead directly to cost of goods sold. Given these facts, what was the number of units of product in beginning inventory?

Answer units