Easy Math question

The cost of enclosures ($300) shot up by 40%, by what % should the company reduce the display cost ($500) if it wants to keep the total cost ($2000) the same?

So if the cost of enclosures shot up by $120 (40% of 300).
To keep the total display cost the same, you need display cost to be $380 (500-120). So wouldn't you simply do (380/500) to get your answer?

The website, however, insists the answer is where you do (120/500).

Am I mistaken here? I feel so stupid for asking this but oh well.

 

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