Consider a restaurant that offers takeaway lunch packages between 12:00 and 14:00. The workers are exhausted since

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Question:

Consider a restaurant that offers takeaway lunch packages between 12:00 and 14:00. The workers are exhausted since the packaging requires a lot of manual work and the packages are very popular, so people are waiting in large queues every day. The owner decides to buy a packaging machine that reduces the workload of the workers by 60% for every package. With that, she hopes to reduce the pressure on the employees. What the owner did not expect was that they now can give out the packages faster, which allows them to serve even more people during the available time slot, which results in even more people coming to the restaurant. On average, they have 30% more customers. Furthermore, instead of only one order, every tenth customer now orders two packages, which has never happened before.

Calculate the rebound effect regarding the workload per worker with the following formula:

(Expected efficiency gain - Actual reduction) / Expected efficiency gain)