Please answer and explain. I am taking the test right now:

Perla Kennel usestenant-days as its measure of activity, an animal housed in the kennel for one dey is counted as one tenantday During March, the kennel budgeted for 2,240 tenant-days, but its actual level of activity was 2,200 tenant days. The kennel has provided the following data concerning the formulas used in its budgeting and its actual results for March: Data used in budgeting: elemeint per element pe Revenue -3460 4,230 770 9.00 77505.60 0.60 23,410 22.90 Wages and salaries 1580 Facility expenses Admiristrative expenses Total expenses 9,850 Actual results for March Revenue Wages and salorles Food and supplies Facility expenses Administratilve expenses 75,580 S 20,990 s 21,880 19,180 11,210 The activity variance for wages and salaries in March would be closest to: O $488 F O $308F O$488U O $308 U