The cost of renting a rototiller is $19.50 for the first hour and $7.95 for each additional hour. Ho

Discussion in 'Calculator Requests' started by math_celebrity, Sep 17, 2016.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    The cost of renting a rototiller is $19.50 for the first hour and $7.95 for each additional hour. How long can a person have the rototiller if the cost must be less than $95?

    Setup the inequality:
    $19.50 + $7.95x < $95

    Subtract 19.50 from both sides:
    7.95x < 75.50

    Divide each side of the inequality by 7.95 to isolate x
    x < 9.5

    The next lowest integer is 9. So we take 9 + the first hour of renting to get 10 total hours.

    Check our work:
    $7.95 * 9.5 + $19.50
    $71.55 + $19.50 = $91.05
     

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