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During the month of May, Hydra Company purchased $41,500 of raw materials, used $22,500 of direct labor, and applied manufacturing overhead at a rate of 300% of direct labor costs. The balance of raw materials inventory did not change, but the balance of work in process inventory, increased $9,600. The raw materials used in May included $7,000 of indirect materials and the cost of goods sold in May was $110,600. What is the change in the finished goods inventory balance during the month of May? Decreased by $23.500 Decreased by $2,700 Increased by $4.300 Increased by $11,300 None of the above