Final answer:
Noah paid $18.90 for the hoodie after applying a 30% off coupon.
Step-by-step explanation:
To calculate the price Noah paid for the hoodie, we need to find the amount of the discount and subtract it from the regular price. The discount amount can be found by multiplying the regular price by the discount percentage (30%).
The discount amount is $27 x 0.30 = $8.10. To find the final price, we subtract the discount amount from the regular price: $27 - $8.10 = $18.90.
Therefore, Noah paid $18.90 for the hoodie.