Engineering Economy 16th Edition by William Sullivan ,Elin Wicks, Koelling,

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The number in parentheses that follows each problem refers to the section from which the problem is taken.
Estimate the cost of an oil change (5 quarts of oil) and a new oil filter for your automobile at a local service station. It takes a technician 20 minutes to do this job. Compare your estimate with the actual cost of an oil change at the service station. What percent markup is being made by the service station