23. Mexico Company’s standard variable manufacturing overhead rate was $20 per hour calculated on the basis of machine hours. According to standards, the company took 1 hour to complete three units (i.e., 20 minutes per unit). During the month of June, the company operated for 4,100 hours and manufactured 12,000 units of product. The actual variable manufacturing overhead for June was $85,000.
On the basis of above data, the variable manufacturing overhead efficiency variance for June was:
Computation:
Variable manufacturing overhead efficiency variance = (Actual hours × Standard overhead rate) – (Standard hours × Standard overhead rate)
= (4,100 hours × $20) – (*4,000 hours × $20)
= $82,000 – $80,000
= 2,000 unfavorable
Or we can compute above variance using factored formula as follows:
Variable manufacturing overhead efficiency variance = Standard overhead rate × (Actual hours – Standard hours)
= $20 × (4,100 hours – *4,000 hours)
= $20 × 100 hours
= $2,000 hours
*Standard hours allowed for actual production:
The standard time to complete one unit is 20 minutes. Therefore, the standard time to complete 12,000 units would be 240,000 minutes or 4,000 hours as computed below:
12,000 units × 20 minutes = 240,000 minutes
240,000 minutes/60 = 4,000 hours
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