In September, Numbers Incorporated sold 40,000 units of its only product for $262,000, and incurred a total cost of $245,000, of which $27,000 was fixed costs. The flexible budget for September showed total sales of $320,000. Among variances of the period were: total variable cost flexible-budget variance, $6,000U; total flexible-budget variance, $67,000U; and, sales volume variance, in terms of contribution margin, $29,000U. The sales volume variance, in terms of operating income, for September was: Multiple Choice $29,000 unfavorable. $38,000 unfavorable. $101,000 unfavorable. $18,000 unfavorable