19.99 $ plus tax?

I wanted to ask if anyone knows what it means and I would like to buy Call of Duty World at War US Version from the Xbox Store, but it says $ 19.99 plus tax and tax is yes I think I have to pay VAT if I pay with a prepaid card $ 19.99 or more?

You also have to pay the tax

Do you know how much I have to pay in total if I have to pay $ 19.99 and $ 24.99 plus tax?

Depends on. Each state has its own rates:

https://en.wikipedia.org/...risdiction

No matter how you pay, you have to pay the $ 19.99 and tax. You can find out how much this tax is in the store or via Google, which is different in every state and sometimes even in cities in one state.