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Secondary I • 9mo.

Hello:)

I also do not understand how to calculate the discount of 20% on a t-shirt which costs 25$. Thank you in advance

Mathematics
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Explanations (1)

  • Explanation from Alloprof

    Explanation from Alloprof

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

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    Team Alloprof • 9mo. edited September 2021

    Hi PeacefulEarth1054! :)

    When calculating a discount, you have to think that you will get the t-shirt at a lower price than the initial one! In your case, there is a 20% discount.

    My trick for solving such situation is as follows:

    1 +/- (discount / tax)

    In this case, we have a 20% discount, therefore, we apply the above rule by subtracting; 1-0.2 = 0.8

    The only step remaining is to multiply the price of your t-shirt ($ 25) by the discount; 25 * 0.8 = $ 20


    If, on the contrary, you had a 20% tax, you would have applied the rule, but by adding this time; 1 + 0.2 = 1.2

    Then, multiply the price of the t-shirt ($ 25) * 1.2 = $ 30

    Let us know if we can help you with anything else!


    -Marilee