At the beginning of the year, Walmart expected to produce 3,500 units of a singular product. Their estimate of fixed overhead was $14,000, and its estimate of variable overhead per unit was $6.82.

At the conclusion of the year, 2,800 units were actually produced, with actual total overhead cost of $29,106.

What was X Company's total overhead flexible budget variance for the year [a positive number means a favorable variance; a negative number means an unfavorable variance]?