The following labor standards have been established for a particular product: The following data pertain to operations concerning the product for the last month: Required: a. What is the labor rate variance for the month? (Input the amount as a positive value. Leave no cells blank - be certain to enter "O" wherever required. Indicate the effect of each variance by selecting " F " for favorable, " U " for unfavorable, and "None" for no effect (i.e., zero variance.) b. What is the labor efficiency variance for the month? (Input the amount as a positive value. Leave no cells blank - be certain to enter "o" wherever required. Indicate. the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e. zero variance.)