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###### A hotel in Hong Kong has 4 room service maids to clean daily 31 standard rooms,...

A hotel in Hong Kong has 4 room service maids to clean daily 31 standard rooms, 20 deluxe rooms and 9 suites. The standard times for servicing rooms are as follows: standard rooms 20 minutes, deluxe rooms 25 minutes and suites 40 minutes. All room service maids work an 7-hour day. Calculate the efficiency of the maids. (provide percentage value round to two decimal places).

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