Karen is a trusted employee whose productivity declines as she works more and more hours each day. After careful observation of her work performance, her manager prepared the following chart. Daily Number of Hours Worked by Karen / Total Numbers of Work Units Completed 1/100 2/190 3/270 4/340 5/400 6/450 7/480 8/500 Karen's total cost to the firm is $11 per hour. Each work unit completed is worth $0.21 to the firm. Ignoring all other possibilities and considerations, for how many hours should the firm hire Karen per day

5 hours

Explanation:

Total Cost  = A x $11 per hr

Worth for the Firm = Number of units produced * Worth per unit

Benefit = D - C

Hours   Units Produced    Total Cost    Worth for the Firm    Benefit

1                   100                        11                      21.00                    10.00

2                  190                        22                    39.90                    17.90

3                  270                       33                     56.70                    23.70

4                  340                       44                     71.40                     27.40

5                  400                       55                    84.00                    29.00  (More benefit)

6                  450                       66                    94.50                    28.50

7                  480                         77                    100.80                   23.80

8                  500                        88                    105.00                   17.00

i might look it up later.