for 19,000 bed frames, it should have took you 1,900 direct labor hours, which equates to an overhead of $3,800. It actually took you 2,100 direct labor hours for those 19,000 bed frames, which equates to an overhead of $4,200.
For efficiency variances, use actual time spent spent * standard rate and the time you was supposed to spend * standard rate.
You need the 19,000 bed frames to figure out how many direct labor hours that should have taken. It says .10, so thats how we get that it should have taken 1,900 direct labor hours.
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