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Mike's Service Station performs oil changes for cars. Each oil change has a standard time of 0.8 direct labor hours. The standard direct labor hour rate is $17.00 per hour. Data relating to oil changes for the month of September follow: Actual number of oil changes performed 2,500 Actual direct labor hours worked 1,000 Actual total direct labor cost $3,000 What is the labor rate variance for September? O A. $3,000 unfavorable O B. $7,500 favorable O C. $3,000 favorable O D. $7,500 unfavorable