PLEASE SHOW WORK. I really am getting confused

An invoice is dated June 28 for $867.60 with terms of 8/10 EOM. Merchandise was received on July 3. How much is due if the invoice is paid on or before July 10? on August 10? on August 30? Merchandise received on July 20 is charged to the store on an invoice dated July 8 for $1, 254 with terms of 6/10-60x. What is the last day for taking the cash discount? If the invoice is paid on September 17, how much should be remitted