A cell phone plan costs $20 a month and includes 200 free minutes. Each additional minute costs 5 ce

Discussion in 'Calculator Requests' started by math_celebrity, Aug 24, 2020.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    A cell phone plan costs $20 a month and includes 200 free minutes. Each additional minute costs 5 cents. If you use your cell phone for at least 200 minutes a month, write a function C(x) that represents the total cost per x minutes.

    We add the flat rate per month to 5% of the number of minutes over 200:
    C(x) = 20 + 0.05(x - 200)
     

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