To calculate the total cost of the board game including sales tax in Texas, we need to multiply the cost of the board game by the sales tax rate.
Sales tax = Cost of the board game * Sales tax rate
Sales tax = $20 * 6.25/100
Sales tax = $1.25
Total cost of the board game including sales tax = Cost of the board game + Sales tax
Total cost of the board game including sales tax = $20 + $1.25
Total cost of the board game including sales tax = $21.25
The total cost of the board game, including sales tax in Texas, is $21.25.