Final answer:
To calculate the new price of the skateboard, we find 20% of $38 which is $7.60, then subtract it from the original price to get the final price of $30.40.
Step-by-step explanation:
Bao buys a skateboard that originally cost $38. He uses a coupon to save 20%. To find the new price of the skateboard, we must first calculate the discount amount by converting the percentage to a decimal (20% = 0.20) and then multiplying it by the original price. So, $38 × 0.20 = $7.60 is the discount amount.
Next, subtract the discount amount from the original price to find the new price: $38 - $7.60 = $30.40. Therefore, the new price of the skateboard after applying the 20% discount is $30.40.