Nitrol Corporation manufactures brass vases using a standard cost system with standard machine-hours as the activity base for overhead. The following information relates to vase production at Nitrol for last year:

	Estimated for year	Actual results for year
Variable overhead	$93,600	$97,310
Fixed overhead	$239,200	$236,400
Machine-hours	104,000	107,000

The standard machine-hours per vase is 1.25. Last year Nitrol produced 83,000 vases.

What was Nitrol's variable overhead rate variance for last year?