Answer:
$60.
Explanation:
Let x be the original price of the pair of headphones.
We have been given that a store has a 40% off sale on headphones. This means that price of headphones after the sales would be 60% (100-40) of x.
We are also told that with the discount, the price of one pair of headphones is $36.
We can represent this information is an equation as:




Therefore, the original price of the pair of headphones is $60.