Lantagne Clinic uses client-visits as its measure of activity. During May, the clinic budgeted for 3,800 client-visits, but its actual level of activity was 3,820 client-visits. The clinic has provided the following data concerning the formulas used in its budgeting and its actual results for May: Data used in budgeting: Actual results for May: The activity variance for net operating income in May would be closest to: $284U$284F$386U$386F