What is the relationship essential for calculating yield?

Calculating yield is fundamentally about understanding the efficiency and effectiveness of resource utilization. The essential relationship in calculating yield is the ratio of the amount utilized to the amount available. This ratio measures how much of the available resource—be it time, materials, or services—is being effectively used to generate output.

By focusing on the amount utilized in relation to the amount available, you can derive insights into operational performance and identify areas for improvement. For example, in a golf facility, this could pertain to how many tee times or available golf carts are being used compared to how many are available. This information is crucial for optimizing operations, enhancing customer satisfaction, and ultimately driving profitability.

In contrast, the other options address aspects of pricing, financial performance, or sales revenue, but they do not directly capture the specific relationship necessary for yield calculation. Understanding yield requires a focus on utilization relative to availability, making choice C the correct answer.