t. Eady Corporation, maintenance is a variable overthead cost that is based on machine-hours. The performance report for July showed that actual mainterance costs totated 11,090 and that the associated rate variance was $350 unfavorable. 186,000 machine-hours were actually worked during July, the standard maintenance cost per machine. our was: Multiple Choice $185 pet machine-nout St97 per mochine-hour $191 per machine-hove $170 per machine-hour