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 $18,040 and the actual level of activity for the period was 4,100 MHs. What was the variable overhead rate variance for the month? 1640F 0 410F 16400 4100 12 26 6$ Warp Manufacturing Corporation uses a standard cost system for the production of its ski lift chairs. Warp uses machine-hours as an overhead base. The variable manufacturing overhead standards for each chair are 1.2 machine-hours at a standard cost of $18 per hour. During the month of September, Warp incurred 34,000 machine hours in the production of 32.000 ski lift chairs. The total variable manufacturing overhead cost was $649.400. What is Warp's variable overhead rate variance for September 79200F 374000 O 418000 No answer text provided