In October, Riverbed Inc, reports 43,400 actual direct labor hours and incurs $218,000 of manufacturing overhead costs. Standard hours allowed for the month's production is 43,100 hours. Riverbed's predetermined overhead rate is $5.03 per direct labor hour. The fexible manufacturing overhead budget shows that budgeted costs are $3.80 variable per direct labor hour and $73,800 fixed. Compute the manufacturing overhead volume variance. Normal capacity was 60,000 direct labor hours. Identify whether the variance is favorable or unfavorable. Total manufacturing overhead volume variance $