All of the following are examples of variable costs EXCEPT:

In the context of real estate finance, distinguishing between fixed and variable costs is crucial for effective budget management and financial forecasting. Variable costs are expenses that change in direct proportion to the level of business activity or production volume. They fluctuate based on operational needs, much like how costs associated with food and beverage materials, laundry expenses, and credit card fees vary depending on sales or occupancy rates.

The choice identified pertains to the general manager's salary, which is considered a fixed cost. This is because the general manager's salary does not change with the volume of sales or occupancy; it remains constant regardless of the hotel's revenue performance or operational activity. Thus, it is categorized differently from variable costs that are directly affected by business fluctuations.

Understanding this distinction is essential for effective financial analysis and helps in budgeting and forecasting for businesses, especially in the real estate sector where managing costs efficiently can significantly impact profitability.