Question：Financial gearing refers to the variability of returns caused by debt interest, and therefore financial risk is often measured by the debt to equity ratio.
　　Operating gearing refers to the variability of returns caused by the fixed costs of the business operation, and therefore business risk is best measured by which of the following?
　　A. Operating profit to sales.
　　B. Contribution to PBIT.
　　C. Sales to fixed costs.
　　D. PBIT to Interest, tax and dividends.
　　The correct answer is: Contribution to PBIT.
　　解析：Operating gearing measures the relationship between contribution and PBIT. Contribution is sales minus variable costs therefore the difference between PBIT and contribution is fixed costs. Low fixed costs will be reflected in a low operating gearing.
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