essentially, a VAT and sales tax have the same end result to a consumer. It just changes how the money is collected. In a VAT, parts of the sales tax are collected in stages, with the end result being the VAT added to the price. A Sales tax just tacks the tax on at the end.\
So a $1.00 item will be $1.10 whether there is a 10% VAT or a 10% sales tax
A 10% VAT is a 10% tax at every step of development A 10% sales tax is 10% ONCE.
E.G a product with 5 steps of development at 10% => ~50% tax