Purchase of a New Toyota Prius by Senior Citizens

How likely are senior citizens (i.e., ≥ 65 years old) to purchase a new Toyota Prius within a year after retirement?

Cobb County Toyota is interested in gathering data to answer the following research question: How likely are senior citizens (i.e., ≥ 65 years old) to purchase a new Toyota Prius within a year after retirement? To enable Cobb County Toyota to collect the necessary data, design four scales: nominal, ordinal, interval, and ratio. Which one of your scale measurements will be most useful to Cobb County Toyota? Explain.