Bartosiewicz Clinic unes cliont-visits as its measure of octivity. Duting Jonuory, the clinie budgeted for 4,500 chentwisits; but its octual level af activity was 4,480 cliont-visits. The clirnic has provided tho following data concernind the formulas uset in its butgeting and its actual results for Januarr Date used in budgeting: Actual fesuits for January: The activity variance for net operating income in January would be closest to