When Danica started her own copying and duplicating business, she entered into several contractual arrangements. First, she bought $900 worth of paper from Springfield Business Supply, promising to pay the money within 30 days. Then, using her bank credit card, she purchased spreadsheet and word processing software. In addition, she bought several copying units from the manufacturer on a 24-month installment purchase plan. The plan permitted the seller to repossess the machines if Danica defaulted on payments. Finally, Duncan borrowed $2,000 from the Ozark Region National Bank to meet current expenses, giving a U.S. Treasury bond as security for repayment.

• Which of the transactions entered into by Danica involved a debtor-creditor

relationship?

• Which relationships were secured?