Following is a partially completed performance report for a recent week for direct labor in the binding department of a book publisher: The original budget is based on the expectation that 8,100 books would be bound; the standard is 18 books per hour at a pay rate of $17 per hour. During the week, 8,100 books were actually bound. Employees worked 460 hours at an actual total cost of $8,280. Required: o. Calculate the flexed budget amount against which actual performance should be evaluated and then calculate the budget variance. b. Calculate the direct labor efficiency variance in terms of hours. c. Calculate the direct labor rate variance. Note: Do not round intermediate calculations. Note: For all requirements, indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)