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① The cost of having a catering Service to serve food for a party is $150 per head for za persons or less, P130 per head for 21 to 50 persons, and Pilo per head for 51 to 100 persons. For 100 or more persons, the cost is at P100 per head. Represent the total cost as a piecewise function of number of attendees of the party.
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