How to calculate sales tax, VAT or GST using the unitary method when included in sale price

Опубликовано: 18 Август 2021
на канале: The Maths Studio

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Here is another example of using the unitary method

To use the unitary method to find the full amount when 25% of that amount is $80, you can set up a proportion to solve for the unknown total amount (full amount). Here's how to do it:

Let "X" represent the full amount you want to find.

You know that 25% of X is $80, so you can set up the proportion:

25% of X = $80

Find the value of 1% of X by dividing both sides of the equation by 25:

1% of X = $3.20

Now, find the value of X by multiplying both sides of the equation by 100:

100% of X = $3.20 * 100

X = $320

So, the full amount is $320 when 25% of that amount is $80.