Tharaldson Corporation makes a product with the following standard costs:

	Standard Quantity or Hours			Standard Price or Rate			Standard Cost Per Unit
Direct materials		7.6	ounces	$	4.00	per ounce	$	30.40
Direct labor		0.5	hours	$	10.00	per hour	$	5.00
Variable overhead		0.5	hours	$	9.00	per hour	$	4.50

The company reported the following results concerning this product in June.

Originally budgeted output		3,000	units
Actual output		3,100	units
Raw materials used in production		16,300	ounces
Purchases of raw materials		17,400	ounces
Actual direct labor-hours		510	hours
Actual cost of raw materials purchases	$	45,000
Actual direct labor cost	$	13,000
Actual variable overhead cost	$	3,500

The company applies variable overhead on the basis of direct labor-hours. The direct materials purchases variance is computed when the materials are purchased.

The variable overhead efficiency variance for June is: