Gounder, Inc. begins business in May 20X5. On May 23, it buys 400 units of merchandise at $12/unit. On June 5, it sells 300 units for $9,500. On September 12, it purchases 1,500 units at $14/unit. On December 16, it sells 900 units for $28,500. If Gounder uses the FIFO method, what is its 20X5 cost of goods sold? When calculating the answer, round the cost per unit to two decimal points (for example, $15.15).

A $16,800 B $28,500 C $16,000 D $21,000