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The time required to produce the first lot was 5,000 direct labor hours. The total time required to produce the first two lots was 8,000 direct labor hours. If no learning had occurred, the total time required to produce the first two lots would have been 5,000 × 2, or 10,000 direct labor hours. The actual time required divided by the time that would have been required if no learning had taken place is the learning rate under the Cumulative Average-Time Learning Model. 8,000 ÷ 10,000 = .80, so the learning rate on the first two lots was 80%.
This is the rate of decrease in the time required for the second lot. That is not the way to calculate the learning rate under either model.
This is the amount of time required for the first lot divided by the total amount of time required for the first two lots. That is not the way to calculate the learning rate under either model.
This is the learning rate using the Incremental Unit-Time Learning Model.