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    • Thread Starter

    I don't understand how to find out

    Percentage change

    New price of something

    Original price

    I struggle so much with it I've been looking at examples but it doesn't get to my head 🙈
    Posted on the TSR App. Download from Apple or Google Play

    I think a lot of percentages comes down to how well u know ur percentages decimals and fractions.

    Consider the following:

    An item is reduced by 15% in a sale. Its sale price is £35.

    So this question is basically telling us that 85% of the original price is £42.50 Since the original price is 100% and 15% was taken off.

    So there are a few very similar ways of getting the right answer. The most logical way of thinking that will always work is:

    If 85% is £42.50
    1% is £0.50
    100% is £50.

    Essentially what u have done is divide by 85 then multiplied by 100. This can all be done in one eat operation by multiplying 42.50 by 100/85.

    This arise due to the fact that dividing by 85 is the same as multiplying by 1/85.

    This is a specific example however if u take the methodology u should be able to apply it to almost any case.

    If u have any specific questions i can help u with i would be more than happy to.

    Note the fractions are not in there simplest forms, im lazy but u shouldnt be.
    Posted on the TSR App. Download from Apple or Google Play
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