The following data (all in billion $) are the sales and costs (excluding selling and general and administrative costs) of McDonalds for company-operated restaurants (i.e., excluding franchise restaurants).
a). Calculate the labour productivity (in $ sales over $ payroll & benefits costs) and its growth over time. Interpret your results.
b). Calculate the multi factor productivity (in $ sales over $ all operating costs given) and its growth over time. Interpret your results.

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2007 16.6 5.5 4.3 3.9 2008 16.6 5.9 4.3 3.8 2009 Sales Operating costs Food & paper Payroll & benefits Occupancy llease, etc) 15.5 5.2 4.0 3.5