~Hello There!~
Step A:
Divide 120 by 3:
120/3 = 40
$40 is 1/3 of the original price
However, the question says that it was marked down by 1/3, therefore, you must subtract 40 from 120 to get the answer:
120 - 40 = 80
In short, the answer is $80.
Step B:
Divide 80 by 2:
80/2 = 40
$40 is 1/2 of the sales price
The question states that it was marked up by this amount, therefore, you must add it onto 80:
80 + 40 = 120
In short, the answer is $120.
Hope This Helps You!
Good Luck :)
Have A Great Day ^_^
- Hannah ❤