Here is the PHP formula that calculates the profit margin as a percentage:

$sales = 5000; // Placeholder for sales amount
$expenses = 2000; // Placeholder for expenses amount

$profitMargin = ($sales – $expenses) / $sales * 100;

return “The profit margin is: ” . $profitMargin . “%”;

In this formula, we assume that the value of #מחזור מכירות (כולל מע״מ)# is represented by the variable `$sales`, and the value of #הוצאות כולל משכורות (כולל מע״מ)# is represented by the variable `$expenses`. The result will be returned as a percentage.