sales tax is calculated\nbased on the number of items purchased.\nusing a percentage of the price of an…

sales tax is calculated\nbased on the number of items purchased.\nusing a percentage of the price of an item.\nbefore a sale discount is applied.\nas a percentage based on federal law.
Answer
Brief Explanations:
Sales tax is typically a percentage of the price of an item. It's not based on the number of items, is usually applied after discounts, and its rate can vary by location (not just federal - state and local also play a role).
Answer:
using a percentage of the price of an item.