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Math Help - Percentages

  1. #1
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    Percentages

    I need urgent help with this question: If you receive 4 cents off per litre of fuel pumped, when will you get more than 4% off the total price of the petrol you pump?

    Thanks!!!
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  2. #2
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    Quote Originally Posted by Stella View Post
    I need urgent help with this question: If you receive 4 cents off per litre of fuel pumped, when will you get more than 4% off the total price of the petrol you pump?

    Thanks!!!
    I assume that you pay your petrol in Australian Dollars?

    If the price of one litre of petrol is below 100 cts = 1 $ then 4 cts are more than 4 % of the petrol price.
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  3. #3
    Super Member angel.white's Avatar
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    Quote Originally Posted by Stella View Post
    I need urgent help with this question: If you receive 4 cents off per litre of fuel pumped, when will you get more than 4% off the total price of the petrol you pump?

    Thanks!!!
    So let the cost of the petrol equal x cents

    Then you are paying x-4 cents per liter

    and you want to know when it hits 4 percent, so (1-.04)x = .96x

    When these two are equal you will be getting 4% off (or think of it as paying 96%), so we set them equal and solve.

    x-4 = .96x

    x-.96x-4 = 0

    .04x-4=0

    .04x = 4

    x= 100

    So when x = 100 cents, then (4%)*100 = 4 cents

    So any time the petrol is less than 100 cents per liter, we will get more than 4% off the total price of the petrol.
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