Calculate Percentage

Our store software currently displays the total amount saved (the list price minus our price) for every product using the code below:

'Calculate "YouSave"
If Product_ListPrice > 0 Then
Product_YouSave = Product_ListPrice - Product_LowestPrice
End If

I, however, would like to also diplay the percentage saved next to the amount saved. I tried using the code below but it won't work. Can someone help me out?

'Calculate "YouSavePercent"
If Product_ListPrice > 0 Then
Product_YouSavePercent = ((1 - (Product_LowestPrice / Product_ListPrice) * 100)
End If