Promo: How To Calculate A Discount Percentage On A Price EASILY.
Calculating a percentage discount on a price is far from easy!
However, it is very practical to calculate a promo in a store.
Yes, how much is this 15% discount on a 50 € sweater?
No need to take out your calculator or go to the pifometer!
Fortunately, to easily calculate a percentage off a price, there is a SUPER simple math trick.
The trick is to know that X percent of Y is equal to Y percent of X. See why:
How to do
X percent of Y is equal to Y percent of X.
Example n ° 1:
If you want to calculate how much is 7% of 50, you can very well do 50% of 7 instead, which is 3.5.
Which means that 7% of 50 is also equal to 3.5.
Example n ° 2:
If you want to know how much is 2% of 20, do 20% of 2 instead and you will get 0.4.
Which means that 2% of 20 is also equal to 0.4.
Example n ° 3:
12% of 25 can therefore also be written 25% of 12. Which gives a result of 3.
Which means that 12% of 25 is also equal to 3.
Results
And there you have it, you now know how to easily calculate a percentage discount on a price :-)
Easy, fast and convenient, isn't it?
It's still better than doing a pifometer!
This tip is useful for calculating promos and sales in stores and avoiding getting ripped off.
And if you are a salesperson, this calculation method should also make it easier for you to calculate the discounts you can offer to your customers.
Why does it work?
The explanation of this trick is in one word: commutativity.
What is commutativity? It is the property of an operation that allows you to change the order of terms without changing the resultt.
So for example, 0.07 multiplied by 50 will always equal 50 multiplied by 0.07.
This property facilitates calculations. Above all, it allows you to be more efficient in mental arithmetic.
Bonus tip
You can also calculate a percentage discount on a price by multiplying the 2 figures concerned.
If we go back to Example 1, this means that we can multiply 7 by 50, which makes 350.
Then divide that result by 100, which is also 3.5.
Handy in that sense too, isn't it?
Your turn...
How do you calculate a percentage discount? Share your tips in the comments. We can't wait to hear from you!
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Also to discover:
How To Multiply Large Numbers In Your Head WITHOUT Calculator.
Rule of Three: One Site to Calculate It in 10 Seconds!
