you have used total of 'Price' in the calculation.
you need to use total of 'TotalPrice' instead.
from the dropdown list where you select the column, select the TotalPrice column which is calculated as Price * Quantity
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.