Chefs in Queue

i am not getting hint given for thhis question can any one please explain me this question

Official hints can be found here

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You have to chose price such that the profit is max.
4
30
20
53
14
If 14 was selected then profit=56
for 20 profit=60
for 30 profit=60
for 53 profit=53

sorry guys question was Chefs in Queue