Belle Auto Detailing reported the following results for the past week: Actual number of cars detailed 250 Actual direct labor hours used 625 Actual total direct labor cost $6,500 Budgeted number of cars to be detailed 300 Standard direct labor cost per hour $10 Standard direct labor per car 1.5 What is Belle's direct labor rate variance? $250 unfavorable $150 unfavorable $150 favorable $250 favorable