MajorNet Systems is a​ start-up company that makes connectors for​ high-speed Internet connections. The company has budgeted variable costs of $ 145 for each connector and fixed costs of $ 7 comma 500 per month. MajorNet​'s static budget predicted production and sales of 100 connectors in​ August, but the company actually produced and sold only 84 connectors at a total cost of $ 21 comma 000. MajorNet​'s sales volume variance for total costs is