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     EduGorilla 
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    A hotel room has occupancy for 4 persons. The daily tariff is $39 for the first person and z dollars for each additional person. If 3 persons take the room for one day and each pays $21, what is the value of z?

    Options :-

    1. 6
    2. 8
    3. 12
    4. 13
    5. 24
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