Final answer:
The promotion-to-sales ratio is used by managers for making year-to-year comparisons of their promotional activities, not for determining salaries, calculating profit margins, or tracking attendance.
Step-by-step explanation:
The promotion-to-sales ratio is a tool used by managers primarily for making year-to-year comparisons of their promotional programs or marketing strategies. It allows them to assess how effectively their promotional activities contribute to sales revenue. The ratio is not commonly used for determining employee salaries, calculating profit margins, or tracking employee attendance, as these areas are assessed with different metrics and methods. In the context of labor markets, the price of labor can be defined by annual salary or hourly wage, and the quantity of labor can be measured, for example, by the number of workers or the number of hours worked. However, these measurements don't directly relate to the promotion-to-sales ratio.