(a) On March 2, Shamrock Company sold $897,900 of merchandise to Pharoah Company on account, terms 2/10, n/30. The cost of the merchandise sold was $594,200. (b) On March 6, Pharoah Company returned $100,900 of the merchandise purchased on March 2. The cost of the merchandise returned was $67,500. (c) On March 12, Shamrock Company received the balance due from Pharoah Company.