A function that calculates sales tax : Definition « Functions « PHP

A function that calculates sales tax

$price = 4.9;
$tax = .04;

function calculate_cost($tax, $price) {
     $sales_tax = $tax;
     return $price + ($price * $sales_tax);

$total_cost = calculate_cost ($tax, $price);
$total_cost = round($total_cost, 2);

print "Total cost: ".$total_cost;

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