Final answer:
Noah used a 30% off coupon and paid $28 for jeans. The problem is solved by recognizing that $28 represents 70% of the original price. Dividing $28 by 0.70 gives the original price of the jeans, which is $40.
Step-by-step explanation:
Noah has a coupon for 30% off the regular price of jeans. He ends up paying $28 after applying the discount. To find the original price, we use the concept that the price he paid is 70% (100% - 30% discount) of the regular price. The calculation would look like this:
Let x be the regular price.
70% of x = $28
0.70 * x = $28
x = $28 / 0.70
x = $40
The answer is that the regular price of the jeans is $40.