In case anyone needs in, the rate can be found here. As of September 18, 2012, the rate was 8.375%. There are no sales tax exceptions on watches unfortunately.
The formula is:
sales tax = sales tax rate * price
If you want the total purchase price, add the price and sales tax together. If you don't know the sales tax rate for your location, you can locate it here: sales tax rates by city. You can also plug in the price and rate into a sales tax...
Tennessee's sales tax rate depends on the city where the purchase is made. You can look up your rate at Tennessee sales tax rates by city. Once you have the rate, plug in your price and sales tax rate into the sales tax calculator to get your total purchase price.