I see you have a question about sales tax.
Sounds like you are from outside the US originally.
There is no VAT (Value-added tax) in the United States.
The only tax that applies is a local and/or state sales tax. It is always added to the gross sale amount.
In most cases, you only collect the sales tax for sales to someone in the state you are in, in this case, a consumer who is in Rhode Island.
If your business has a physical location in another state, you may need to collect sales tax for that location separately.
All information about the RI sales tax can be found here: http://www.tax.ri.gov/regulations/salestax/
I hope this answers your question about the RI tax. I f you need any followup or clarification, feel free to ask before you rate the answer. Thanks!