Calculating Discount Percentage of a given discounted price

Use this formula for calculating the discount percentage :

Discount%=(Original Price - Sale price)/Original price*100

Translating it into code, it should be something like :

$percent = (($rowx->Orgprice - $rowx->SalePrice)*100) /$rowx->Orgprice ;

selling price = actual price - (actual price * (discount / 100))

So for example if (actual price) = $15, (discount) = 5%

selling price = 15 - (15 * (5 / 100)) = $14.25

The correct formula is 1 - (sale price / original) * 100, so:

$percent = 1 - ($rowx->SalePrice / $rowx->Orgprice) * 100;
$percent = 1 - (25 / 50) * 100 = 50