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20 September, 16:44

For 30 persons or fewer $10 per person. For every additional person $9 per person. Irene paid the company $390 for her department event. How many people did she cater for?

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  1. 20 September, 16:49
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    She catered for 40 people.

    Step-by-step explanation:

    According to the information given, you can write an equation that indicates that 30 people multiply for its cost that is $10 plus the number of people after 30 for its cost that is $9 is equal to $390. According to this, the equation is:

    10 (30) + 9x = 390, where

    x = number of people after 30

    Then, you can solve for x:

    300+9x = 390

    9x=390-300

    9x = 90

    x=90/9

    x=10

    The answer is that she catered for 40 people, 30 people at a cost of $10 and 10 people for a cost of $9.
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