How do you calculate the cost of quality as a percentage of sales?

How do you calculate the cost of quality as a percentage of sales?

• A. (Prevention + Appraisal + Internal Failure + External Failure) / Sales × 100.
• B. (Prevention + Appraisal) / Sales × 100.
• C. (Internal + External) / COGS × 100.
• D. (Total quality costs) / Net income × 100.

Answer: (A)

Cost of quality as a percentage of sales is found by adding all quality-related costs—prevention, appraisal, internal failure, and external failure—then dividing that total by sales and multiplying by 100. This approach captures every effort to build quality and every cost that arises when quality problems occur, all in relation to the revenue from selling the product or service. Prevention costs cover activities that stop defects, like training and process improvements. Appraisal costs include inspection and testing to detect defects. Internal failure costs are the costs of defects found before delivery, such as rework or scrap. External failure costs happen after delivery, including warranty work and returns. Taking the sum of these four types and dividing by sales shows how much quality-related spending occurs per unit of revenue, which is why this method is the correct one. The other options fall short because they omit one or more cost types, or use an inappropriate denominator such as COGS or net income, which would not accurately reflect the cost of quality as a portion of sales.

Cost of quality as a percentage of sales is found by adding all quality-related costs—prevention, appraisal, internal failure, and external failure—then dividing that total by sales and multiplying by 100. This approach captures every effort to build quality and every cost that arises when quality problems occur, all in relation to the revenue from selling the product or service. Prevention costs cover activities that stop defects, like training and process improvements. Appraisal costs include inspection and testing to detect defects. Internal failure costs are the costs of defects found before delivery, such as rework or scrap. External failure costs happen after delivery, including warranty work and returns. Taking the sum of these four types and dividing by sales shows how much quality-related spending occurs per unit of revenue, which is why this method is the correct one. The other options fall short because they omit one or more cost types, or use an inappropriate denominator such as COGS or net income, which would not accurately reflect the cost of quality as a portion of sales.