Revenue and costs: a) Calculation of sales volume and sales revenue

The idea

Sales volume is the physical quantity of goods or services a business sells over a specific period, measured in units. Sales revenue, also known as turnover, is the total monetary value generated from these sales before any costs are deducted. To calculate sales revenue, multiply the sales volume by the selling price per unit (Revenue = Price × Quantity). For example, if a firm sells 500 units of a product at £20 each, the sales volume is 500 units, and the sales revenue is £10,000. Understanding both metrics is crucial for assessing a firm's market performance and forms the foundation for calculating profit and market share.

What earns the marks

• Sales volume is measured in units, representing the total physical quantity sold.
• Sales revenue is measured in currency, representing the total income generated from sales.
• The formula for calculating sales revenue is Selling Price × Sales Volume.
• Changes in either the selling price or the sales volume will directly impact the total sales revenue, assuming the other variable remains constant.

Common mistakes and how to put them right

• Confusing sales volume with sales revenue.

  Put it right: Volume is the number of units sold, whereas revenue is the monetary value of those sales.

• Assuming sales revenue is the same as profit.

  Put it right: Revenue is the total income before costs are deducted, whereas profit is revenue minus costs.

• Forgetting to include units of measurement.

  Put it right: State volume in units (e.g., items, kilograms) and revenue in the correct currency (e.g., £).

Exam tips

• Always double-check whether a question asks for volume or revenue to ensure you apply the correct formula and units.
• When calculating revenue from a table of data, ensure you use the selling price rather than the cost price.
• Show your working out (Price × Quantity) even in multiple-choice questions to avoid simple arithmetic errors.