Astore has a 4 0 % 40%40, percent off sale on headphones. with this discount, the price of one pair of headphones is $ 3 6 $36dollar sign, 36. what is the original price of the pair of headphones?

For this case what you should do is solve the problem using for example a rule of three
 60% ---> 36
 100% ---> x
 Clearing x we have:
 x = (100/60) * (36) = $ 60
 Checking the result:
 40% of 60 is
 (0.40) * (60) = 24
 60-24 = 36 $
 
 the original price of the pair of headphones is $ 60