Assume Nattie Inc. sold the following items in January for $10 each: 1 item on January 3 with a unit cost of $5 1 item on January 15 with a unit cost of $5.50 1 item on January 22 with a unit cost of $6.50 1 item on January 31 for $7 What is the cost of goods sold for January assuming the weighted average method? A) 324 B) 28 C) 540 D) $16