A cell phone costs $20 for 400 minutes and $2 for each extra minute. Gina uses 408 minutes. How m

Discussion in 'Calculator Requests' started by math_celebrity, Jan 18, 2017.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    A cell phone costs $20 for 400 minutes and $2 for each extra minute. Gina uses 408 minutes. How much will it cost?

    Set up the cost function for minutes (m) if m is greater than or equal to 400
    C(m) = 20 + 2(m - 400)

    For m = 408, we have:
    C(408) = 20 + 2(408 - 400)
    C(408) = 20 + 2(8)
    C(408) = 36

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