Calcolo iva php

$prezzo = 12.21;
$iva = 22;
$qty = 1;

$prezzo_tot = $prezzo * $qty;

$iva_val = ($prezzo_tot * $iva)/100;

$totale = $prezzo_tot + $iva_val;

echo number_format($totale, 2, '.', '');

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