Sesareo Tile Installation Corporation measures its activity in terms of square feet of tile installed. Last month, the budgeted level of activity was 1,130 square feet and the actual level of activity was 1,180 square feet. The company's owner budgets for supply costs, a variable overhead cost, at $2.60 per square foot. The actual supply cost last month was $2,130. In the company's flexible budget performance report for last month, what would have been the variance for supply costs?