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  4. Calculate VAT on a price and round to two decimal places
/*Usage:You want to calculate 17.5% VAT on a price of £4.67$price_without_vat = 4.67echo vat($price_without_vat);
This would return the new amount with 17.5% added, and would be rounded to 2 decimal places*/
function vat($price_without_vat)
{
$vat = 17.5; // define what % vat is
$price_with_vat = $price_without_vat + ($vat*($price_without_vat/100));
// work out the amount of vat $price_with_vat = round($price, 2);
// round to 2 decimal places return $price_with_vat;
}?>