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 $7,500 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 $21,000. majornet's total flexible budget cost for 84 conectors per month is
(a) $14,500.
(b) $12,180.
(c) $19,680.
(d) $21,000.