Need help for this accounting question please!!! I've entered a and b, but am stumped on c.

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On March 6, Swifty Company returned $87,000 of the merchandise purchased on March 2 . The cost of the returned merchandise was $64,200. (List all debit entries before credit entries. Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter 0 for the amounts.) Prepare the journal entries to record the following transactions on Wildhorse Company's books using a perpetual inventory system. (a) Your answer is correct. On March 2, Wildhorse Company sold $870,000 of merchandise on account to Swifty Company, terms 1/10,n/30. The cost of the merchandise sold was $612,000. (List all debit entries before credit entries. Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter 0 for the amounts.) On March 12, Wildhorse Company received the balance due from Swifty Company. (List all debit entries before credit entries. Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter 0 for the amounts.) On March 6, Swifty Company returned $87,000 of the merchandise purchased on March 2 . The cost of the returned merchandise was $64,200. (List all debit entries before credit entries. Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter 0 for the amounts.) Prepare the journal entries to record the following transactions on Wildhorse Company's books using a perpetual inventory system. (a) Your answer is correct. On March 2, Wildhorse Company sold $870,000 of merchandise on account to Swifty Company, terms 1/10,n/30. The cost of the merchandise sold was $612,000. (List all debit entries before credit entries. Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter 0 for the amounts.) On March 12, Wildhorse Company received the balance due from Swifty Company. (List all debit entries before credit entries. Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter 0 for the amounts.)