please find the variable overhead efficiency variance

Piedmont Manufacturing produces metal products with the following standard quantity and cost. infomation: Fixed overhead 5 machine houn (a) 5420 Overhead rates were based on nomal monthly capacity of 12,000 machine hours. - During November, the company produced only 1700. units because of a labor strike, which occurred during union contract negotiations. After the dispute was settled, the company scheduled overtime to try to f. Vahable overhead efficiency vanance