A manufacturing firm uses a flexible budgeting system. It planned to manufacture and sell 100,000 units of product during the year at a variable cost of $4.00 per unit, a fixed cost of $2.00 per unit and a sales price of $10. The firm's actual incurred cost for January was $58,000, the actual production was 10,000 units and the actual revenue was $97,500. What was the revenue flexible budget variance for January