Concord Labs, Inc, provides mad cow disease testing for both state and federal governmental agricultural agencies. Because the company's customers are governmental agencies, prices are strictly regulated. Therefore, Concord Labs must constantly monitor and control its testing costs. Shown below are the standard costs for a typical test. The lab does not maintain an inventory of test tubes. As a result, the tubes purchased each month are used that month. Actual activity for the month of November 2022 , when 1,300 tests were conducted, resulted in the following. Monthly budgeted fixed overhead is $18,460. Revenues for the month were $84,500, and selling and administrative expenses were $3,600. Compute the total overhead variance. Total Overhead variance List of Accounts