1) In Alameda County, the sales tax is 11%. What would the difference in sales tax between a video game that costs $31.99 and a book that costs $18.99 be? 2) In Contra Costa County, the sales tax is 11.5%. What would the difference in sales tax between the same video game and book be in Contra Costa County? 3) A customer returns an item to a toy store in Contra Costa County, but the store has another location in Alameda County. If the customer's receipt shows that he paid $3.22 in tax on an item that costs $27.99, was the item purchased in Contra Costa County or Alameda County?