I really need help understanding this.

EB7. LO 7.3 Record the following transactions in the cash disbursements journal: Mar. 1 Paid Duke Mfg (account number D101) $980 for inventory purchased on Feb. 27 for $1,000. Duke Mfg offered terms of 2/10, n/30, and you paid within the discount period using check #4012. Mar. 3 Paid Emergency Plumbing $450. They just came to fix the leak in the coffee room. Give them account number E143. Use check #4013 and debit the Repairs and Maintenance account, #655. Mar. 5 Used check #4014 to pay Wake Mfg (account number W210) $1.684 for inventory purchased on Feb. 25. no terms offered