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math

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Find out how many calls must be made to make Plan A the better deal.
• Plan A: $45 a month for unlimited calling Plan B $15 a month .10 per min.
I need to write a cost equation for plan A and for plan B then I need to solve.

  • math - ,

    Plan A: cost = 45
    Plan B: cost = .10x + 15, where x is the number of minutes

    You want to know when
    .10x + 15 > 45
    x + 150 > 450
    x > 300

    check:
    for 299 minutes:
    PlanA = 45
    PlanB = 29.90 + 15 = 44.90
    ...... Plan B is still better

    for 301 minutes:
    Plan a = 45
    PlanB = 30.10 + 15 = 45.10
    .... Plan A is better for x > 300

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