Mayo Clinic uses patient-visits as its measure of activity. During September, the clinic budgeted for 3,000 patient-visits, but its actual level of activity was 2,900 patient-visits. The clinic has provided the following data concerning the formulas used in its budgeting and its actual results for September: Data used in budgeting: Compute the total Revenue variance (due to a difference in the actual amount collected per customer from expected). State answer as a positive