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. Billable hoursa Revenue Professional salaries (all variable) Other variable costs (e.g., supplies, computer services) Fixed costs Profit Reported Income Statement 12,000 $1,280,000 710,000 195,000 300,000 75,000 Master Budget 10,000 $1,250,000 655,000 180,000 310,000 $ 105,000 aThese 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.) Flexible Budget Sales Activity Variance Master Budget Revenue Costs: Professional salaries Other variable costs Fixed costs Total costs Profit