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Math Help - percents

  1. #1
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    percents

    i'm buying a gas heater that costs $700 plus $250 per year for operating costs.
    but i'll save 40% on the operating costs (so i'll save $100.).
    how long until the heater pays for itself?
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  2. #2
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    Quote Originally Posted by lasenzagirl30 View Post
    i'm buying a gas heater that costs $700 plus $250 per year for operating costs.
    but i'll save 40% on the operating costs (so i'll save $100.).
    how long until the heater pays for itself?
    If this is a set question, please state it EXACTLY as it's written. Because "but i'll save 40% on the operating costs (so i'll save $100.)" makes no sense whatsoever ....

    Do you mean $100 per year is what you save by saving 40% on operating costs prior to buying the gas heater?? If so, then your prior operating costs are also $250. So buying the heater saves you nothing and so it never pays for itself.

    Or do you mean that after buying the gas heater, you're now saving $100 per year on the operating costs you previously had. In which case it takes 7 years (7 x 100 = 700) for the gas heater to pay for itself. (Except in this day and age of built-in-obsolescence, the heater will probably go kaput well before 7 years have elapsed. The warranty will probably only be for 12 months and all ....)
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