B MC Qu. 10-36 (Static) Amirault Manufacturing Corporation has a... Amirault Manufacturing Corporation has a standard cost system in which it applies manufacturing overhead to products on the basis of standard machine-hours (MHs) at $4.00 per MH. During the month, the actual total variable manufacturing overhead was $18,040 and the actual level of activity for the period was 4,100 MHs. What was the variable overhead rate variance for the month? Multiple Choice O $410 Favorable O $1,640 Unfavorable O $1,640 Favorable O $410 Unfavorable