Help Save & Exit in September, Numbers Incorporated sold 40.000 units of its only product for $339,000, and incurred a total cost of $375,000 of which $34.000 was fixed custs. The flexole budget for September showed total sales of $390.000. Among variances of the period were total variable cost flexible budget variante, $70000 total flexible-budget variance. $810000:und, sales volume variance, in terms of contribution margin, $36,000U The amount of operating income in the flexible budget (FB) for September was. Multiple Choice 510 000 O $47.000 S54,000 $98.000 $105,000