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“The first phase of production has now been completed for the new car seat. The first unit actually took 12.5 hours to make and the total time for the first eight units was 34.3 hours, at which point the learning effect came to an end. Chair Co are planning on adjusting the price to reflect the actual time it took to complete the eighth unit.”
The average time per unit when 8 units are made is 34.3/8 = 4.2875 hours.
Making 8 units involves doubling 3 times.
Therefore if r is the learning rate, 8 x r^3 = 4.2875
So r = this root (4.2875/12.5) = 0.7 (or 70%)This is all explained in my free lectures on learning rates. The lectures are a complete free course for Paper PM and cover everything needed to be able to pass the exam well.
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