Record the following transactions in the Sales Journal and Cash Recepits Journals. The cost of all merchandise sold was 70% of the sales price.
July 2 Sold Merchandise for 21,000 to B.Tate on account. Credit ter,s 2/10, n/30. Sales invoice No. 100

July 5 Received a check for $800 from R.Hyatt in payment of his account

July 8 Sold merchandise to F. Wenger for 900 cash

July 10 Received a check in payment of Sales invoice No. 100 from B. Tate minus 2% discount.

July 15 Sold Merchandise for 9,000 to J. Mays on account. Credit terms 2/10, n/30 Sales invoice No. 101

How do YOU think you would do the journal entries?

Please help with this question, I'm completely stumped. I have read the text and I just don't understand.