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If Rick’s Automotive charges $50 plus $15 for each (15-min) unit of time when making a road call. Twin City Repair charges $70 plus $10 for each unit of time. Under what circumstances would it be more economical for a motorist to call Rick’s? show all work

  • Algebra - ,

    for charges,

    r = 50 + 15m for m units
    t = 70 + 10m

    you want

    r < t
    50 + 15m < 70 + 10m
    5m < 20
    m < 4

    so, if the call lasts less than an hour (4 units of 15 min. each) it will be cheaper to call Rick.

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