need help in the red

1. 2. 3. On December 3, Crane Company sold $513,500 of merchandise to Sheridan Co., terms 3/10, n/30. The cost of the merchandise sold was $318,300 On December 8, Sheridan Co. was granted an allowance of $24,700 for merchandise purchased on December 3. On December 13, Crane Company received the balance due from Sheridan Co