Schriever Corporation is an oil well service company that measures its output by the number of wells serviced. The company has provided the following fixed and variable cost estimates that t uses for budgeting purposes. Variable Fixed Element per element Well per month Serviced $4,500 $1,100 Revenue Employee salaries and wages Servicing materials $57,200 600 S $31,000 Other expenses f 31 wells were actually serviced in May. The planning budget for May was based on 36 wells serviced, but a total The activity variance for net operating income for May would have been closest to: Multiple Choice $14,000 F $9,800 U $9,800 F $14.000 U