Question: Unit times for a job exhibit a learning effect. If the first unit took 30 hours, and the second unit took 21 hours, roughly how
Unit times for a job exhibit a learning effect. If the first unit took 30 hours, and the second unit took 21 hours, roughly how many hours would you estimate the third unit took?
A. 25
B. 19
C.21
D.23
E.17
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