what did I do wrong Total surplus before 4000+17500=21500 total surplus after 12000+9000=21000 changes = 500 thousands
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what did I do wrong
Total surplus before 4000+17500=21500
total surplus after 12000+9000=21000
changes = 500 thousands
![image text in transcribed](https://s3.amazonaws.com/si.experts.images/answers/2024/06/667b609301606_682667b6092c58fb.jpg)
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