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Assuming we have the final value 444,14. Knowing that this final value includes a 24% VAT, what was the amount of the VAT?

I can figure out the sum before the VAT like this: (444,14 / 124) * 100 = 358,18.

However I have some hard time calculating the actual VAT amount. I know I can do 444,14 - 358,18 = 85,96 but how can I figure out this 85,96 if I know only the final value 444,14 and that includes a 24% value?

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  • $\begingroup$ My answer also rounds to $85.96$ but is actually $\frac {66621}{775}$. $\endgroup$ Dec 28, 2017 at 18:25

3 Answers 3

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Let $final\;value=V$ and $percentage=p\%$

Then $VAT=V-\dfrac{100}{100+p}\,V=V\left(1-\dfrac{100}{100+p}\right)=V\,\dfrac{p}{100+p}$

$$VAT=V\frac{p}{100+p}$$

Hope this helps

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  • $\begingroup$ Beautiful! This is what I was looking for! $\endgroup$ Dec 28, 2017 at 20:55
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Final value = $x$

Sum before VAT = $(x/124*100)=\frac{100}{124}x$

VAT = (final value) - (sum before VAT) = $x-\frac{100}{124}x=\frac{24}{124}x$

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  • $\begingroup$ Ok, so basically same as I described it. I was just wondering if there is a way to find it just by knowing the final value and the percentage amount 24%... $\endgroup$ Dec 28, 2017 at 18:26
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If $x$ is the original amount before applying VAT and $A$ is the final amount (in your case $A=444.14$), then $$ A=x+\frac{24}{100}x=\frac{124}{100}x $$ and therefore (with rounding) $$ x=\frac{100}{124}A=\frac{100}{124}\cdot 444.14=358.18 $$ From the first equation you see that the added amount is $$ \frac{24}{100}x=A-x $$ If you want it directly from the final amount, call it $y$. Then $$ y=\frac{24}{100}x=\frac{24}{100}\frac{100}{124}A=\frac{24}{124}A $$ With rounding, $$ \frac{24}{124}\cdot 444.14=85.96 $$

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