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 × [tex]x^{\frac{ln\ leaning\ rate }{ln\ 2}}[/tex]
so
time 4th unit = Hours 1st unit × [tex]4^{\frac{ln\ leaning\ rate }{ln\ 2}}[/tex]
8.1 = 10 × [tex]4^{\frac{ln\ leaning\ rate }{ln\ 2}}[/tex]
ln 0.81 = [tex]{\frac{ln\ leaning\ rate }{ln\ 2}}[/tex] × ln 4
solve it we get
learning rate = 90%
so correct answer is A. 90%