A company sells a product with the following unit standard cost card: $ Selling price 50 Variable cost 20 Fixed production overhead 5 Profit 25 This information is based on budgeted sales of 1,700 units. Actual selling price was $48, unit variable costs were $22 and unit fixed cost $4. Actual sales were 1,800 and 1,950 units were made. The company currently uses marginal costing. What was the sales volume variance