A company has determined that the standard for labor is 2 direct labor hours per unit produced. The variable overhead application rate is $1 per direct labor hour. If the company produces 1000 units with 1930 direct labor hours and the actual variable overhead is $2200, what is the variable overhead efficiency variance? A) $70 favorable B) $70 unfavorable C) $80 favorable D) $80 unfavorable.

Please explain, thanks!