Last time I had money on the appstore, I tried to buy NFS: Undercover for $6.99, I had $7.10 and it said I didn't have enough to buy it. That being said, Apple must have a tax on the apps. What is the tax percentage? Because I plan to buy $24 dollars worth of stuff this upcoming month, and doing the calculations for 20% tax, I'll end up having to pay $28! I'm just wondering. What percentage of the original price is added to the tax?

Thank you Eric. I found my state sales tax and I did the math and now I understand why I couldn't get NFS. Sadly, with my upcoming purcahse plan, I am $.23 over budget. Darn.