Gross revenue is calculated using which of the following formulas?

Gross revenue is calculated using the formula that involves multiplying rates by production units. This formula effectively captures the total income generated from services provided or products sold before any deductions, such as operating expenses or salaries, are made. The "rates" refer to the price charged for each unit of service or product, while "production units" signify the quantity of items sold or services rendered.

Using this method allows a laboratory or organization to measure its overall financial performance by assessing how much money is brought in through its core operations. It provides a clear picture of the earning capacity of the organization based solely on operational activities, uninfluenced by costs or expenses. This understanding is crucial for managerial decisions regarding pricing strategies, production levels, and overall budgeting.

The other options involve different financial metrics. For instance, adding expenses and net income refers to net revenue rather than gross revenue, while subtracting salaries from revenue does not represent a standard calculation to find gross revenue. Lastly, multiplying operational costs by volume does not align with standard revenue calculations, as it focuses on expenses rather than the income generated.