On October 5, Wang Company sells merchandise to Davis Company for $4,800, terms 2/10, n/30. The cost of the merchandise sold is $3,100. On October 7, Davis Company returns defective goods with a selling price of $650 and a fair value of $100. On October 11, Wang Company receives the balance due from Davis Company. Record the October 7 and October 11 transactions on the books of Wang Company. Omit explanations.