The Lyons Company's Cost of Goods Manufactured Was $120,000 When

The Lyons Company's cost of goods manufactured was $120,000 when its sales were $360,000 and its gross margin was $220,000. If the ending inventory of finished goods was $30,000, the beginning inventory of finished goods must have been:

A) $20,000
B) $50,000
C) $110,000
D) $150,000