K\&B is a small management consulting firm. Last month, the firm billed fewer hours than expected, and, as expected, profits were lower than anticipated. a These are hours billed to clients. They are fewer than the number of hours worked because there is nonbillable time (e.g., slack periods, time in training sessions) and because some time worked for clients is not charged to them. Required: Prepare a sales activity variance analysis. (Do not round intermediate calculations. Indicate the effect of each variance by selecting "F" for favorable, or "U" for unfavorable. If there is no effect, do not select either option.)