Lucas is offered either 15% or $21 off his total shopping bill. How much would have to be spent to m

Discussion in 'Calculator Requests' started by math_celebrity, Jan 5, 2018.

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  1. math_celebrity

    math_celebrity Administrator Staff Member

    Lucas is offered either 15% or $21 off his total shopping bill. How much would have to be spent to make the 15% option the best one?

    Let the total bill be b. We have:
    0.15b > 21 <-- Since 15% is 0.15

    Using our inequality calculator, we get b>140.

    So any bill greater than $140 will make the 15% off option the best one, since the discount will be higher than $21.
     

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