151472 OsCommerce Invoice Fix

Hi, Our OsCommerce invoices are being produced with the wrong Tax amount. The tax amount is set to 17.5% but it is taking this amount away from the product amount excluding tax. Instead of taking it away form the product amount including tax. Example: Product cost: $100 Tax: 17.5% OsC is taking 17.5% from $82.5 then displaying its result, and the tax amount. It should look like this. Cost Inc. $100 Cost Exc: $82.50 Tax: 17.5% Tax amount: $17.50 Please can someone sort this for us. Thanks, Ben