The table sets out the number of employees in four firms in the same industry, the average hours worked per day, and the total daily output of each firm. Which firm’s workers have the highest productivity?
- AFirm A: 4 workers, 8 hours, 320 units
- BFirm B: 5 workers, 7 hours, 420 units
- CFirm C: 6 workers, 7 hours, 462 units
- DFirm D: 7 workers, 9 hours, 630 units