If an invoice for $1000 (no shipping) is dated July 14, for goods recieved on July 20, has terms 3/15, n/30: a) Find the last day of the discount period b) If a payment of $300 is made on the last day of the discount period, how much is credited to the invoice. c) When is final payment due, and what is the outstanding balance due on that date? d) Explain how this would be different if the terms were 3/15, n/30, ROG