Truweight Ltd has introduced a new line of weight machines for the catering industry which has required additional steps in the production line. During the first two months of production the labour time for the weight machines was as follows:
The learning curve percentage is

A) 10 per cent.
B) 90 per cent.
C) 100 per cent.
D) 110 per cent.

The learning curve percentage can be calculated by finding the slope of the line graphed in a log-log plot of the time per unit versus the cumulative production. Using the data given, the log of time per unit for each subsequent doubling of production is increasing by approximately 0.15 (log(12)/log(6) ≈ 0.15), which translates to a learning curve percentage of 90%. Therefore, choice B is the correct answer.