debtor and creditor(Ontario-Canada)

1. A)Dr. Warren's office purchased a heart monitor from Hilltop Medical Supplies("Hilltop")on February 9, 2022 for $18,500 on terms of "net 30 days" with the interest of 9% per year payable on unpaid accounts. Dr. Warren did not pay and Hilltop started an action against Dr. Warren on April 4, 2022.Hilltop got judgment on April 28, 2022, for the amount outstanding plus costs in the amount of $885.What is the total amount that Dr. Warren owes Hilltop as of April 28, 2022?Show your work.

B) Assume that it is now June 14, 2022, and Dr. Warren has agreed to pay the full amount owing.Calculate the total amount owing by Dr. Warren.Show your work.