What is the full amount of calculated 5% vat amount $17.8?

Question

I need to know the full amount for the 5% vat, which is given as $ 17.8 I need the principal amount on which this 5% is calculated?

Answer 1

I don't know what a VAT is but it seems you are asking this question:

What is $x$ if:

$0.05x = 17.8$

Well we divide both sides by $0.05$ to get:

$x = 20 * 17.8$

$x = 356$