To calculate the total cost including tax for Noah's video game, we need to add the cost of the game to the sales tax.
Sales tax on Noah's game = 6.5% of $27.99 = $1.82
Total cost for Noah's game = $27.99 + $1.82 = $29.81
Similarly, for Matt's game:
Sales tax on Matt's game = 6.5% of $21.99 = $1.43
Total cost for Matt's game = $21.99 + $1.43 = $23.42
Therefore, Noah will have to pay $29.81 and Matt will have to pay $23.42 including tax.