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Secondary I • 1yr.

Hello, how do I calculate a 20% discount on a sweater that costs $ 10? thank you

Mathematics
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  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

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    Team Alloprof • 1yr.

    Hi

    First of all, a discount indicates a decrease in the price, so you will pay less than $ 10 for the sweater. 

    Here is a trick you can use: 

    You take the number 1 and you put a +/- after it, like this: 

    1 +/-

    If you have a tax, we do 1+

    If we have a discount we do 1-

    In this case, we have a 20% discount (20% corresponds to 0.2, because we make 20/100). In consequence, we do 1-0.2 = 0.8. 

    After this step, we only need to multiply 10 by 0.8 and we get the answer!

    Hope to have helped you!