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 for t days is modeled by n = 30 1 − ekt . after 19 days on the job, a worker is producing 18 units in a day. how many days should pass before this worker is producing 25 units per day? (round your answer to one decimal place.)