The management of a factory finds that the maximum number of units a worker can produce in a day is 30. The learning curve for the number of units N produced per day after a new employee has worked days is modeled by 
. After 20 days on the job, a worker is producing 19 units in a day. How many days should pass before this worker is producing 25 units per day?
?
A. about 36 days.
B. about 45 days.
C. about 30 days.
D. about 10 days.
Answer: A
Mathematics
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