Answer: $5.40
Explanation:
First, let's calculate the tax for each purchase and then find the total amount paid by Dave and James.
For Dave:
Basketball cost = $15
Tax = 8% of $15 = 0.08 * 15 = $1.20
Total amount paid by Dave = Cost + Tax = $15 + $1.20 = $16.20
For James:
Football cost = $20
Tax = 8% of $20 = 0.08 * 20 = $1.60
Total amount paid by James = Cost + Tax = $20 + $1.60 = $21.60
Now, let's find the difference between the amounts paid by Dave and James.
Difference = Amount paid by James - Amount paid by Dave = $21.60 - $16.20 = $5.40
So, the difference in the amounts paid by Dave and James, including tax, is $5.40.