Amirauit Manufacturing Corporation has a standard cost system in which it applies manufacturing overhead to products on the basis of standard machine-hours ( M at $400 per MH During the month, the actual total variable manufacturing overhead was $18.040 and the actual level of activity for the period was 4100 MHs. What was the variable overhead rate variance for the month? Multiple Choice O $110 Favorable O 640 U vorable O $100 Favorite O $410 Unfavorable