Answer: To calculate the total, we need to first calculate the discount and then the tip.
First, calculate the discount: $21.50 x 10% = $2.15
Then, subtract the discount from the subtotal: $21.50 - $2.15 = $19.35
Next, calculate the tip: $19.35 x 20% = $3.87
Finally, add the tip to the subtotal after the discount to find the total: $19.35 + $3.87 = $23.22
Therefore, Abdiel's total would be $23.22 if he uses a coupon for 10% off the subtotal and leaves a 20% tip before the discount.
Explanation: