Since the manager expects the service time at 35 minutes while the employee can do it in 25 minutes, the employee's efficiency is 140%.
The efficiency is calculated based on energy output per energy input. The greater the output with the same amount of input, the greater the efficiency.
Since work done is equal to energy times time, hence, the energy is directly proportional with time.
Parameters given in the problem:
expected time = 35 minutes
production time = 25 minutes.
Therefore:
efficiency = 35/25 x 100% = 140%
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