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Answer:
correct answer for learning curve percentage is A. 90%
Explanation:
given data
average labor cost = $20/hr
Time 1st unit = 10 hours
Time 4th unit = 8.1 hours
solution
we apply here formula for learning curve that is
Time (x) units = Time 1st unit ×
so
time 4th unit = Hours 1st unit ×
8.1 = 10 ×
ln 0.81 = × ln 4
solve it we get
learning rate = 90%
so correct answer is A. 90%