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The following labor standards have been established for a particular product: Standard labor hours per unit of output 4.7 hours Standard labor rate The following data pertain to operations concerning the product for the last month: Required: a. What is the labor rate variance for the month? b. What is the labor efficiency variance for the month? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" variance). Input all amounts as positive values.)