Which of the following is an example of an unliquidated debt?
A promissory note for the sum of 10,000 to be repaid in 6 years at 5 interest.
A cell phone service contract for 29.99 per month.
A bill sent to homeowner by contractor for an additional 500 for cost overruns: owner claims he will pay only 250.
An installment sales contract for the purchase of a 5,000 mower with 200 down and the rest financed at 8 for 3 years.