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Pleiss Corporation applies manufacturing overhead to products on the basis of standard machine-hours.

The company's standard variable manufacturing overhead rate is $2.40 per machine-hour.

The actual variable manufacturing overhead cost for the month was $5,240.

The original budget for the month was based on 2,100 machine-hours.

The company actually worked 2,270 machine-hours during the month.

The standard hours allowed for the actual output of the month totaled 2,280 machine-hours.

What was the variable overhead efficiency variance for the month