At the beginning of the year, X Company expected to produce 3,500 units of its only product. Its estimate of fixed overhead was $11,000, and its estimate of variable overhead per unit was $6.90. At the end of the year, 2,600 units were actually produced, with actual total overhead cost of $29,789. What was X Company's total overhead flexible budget variance for the year [ positive number means a favorable variance; a negative number means an unfavorable variance]