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This is a quantity each product question. 

1. 4 person pay. Each 1u.

2. 3 person pay. Each pay 1u + 2.40

 

      Quantity     Each      Product    
Right  4 1u 4u
Wrong  3 1u + 2.4  3u + 7.2
       

4u = 3u + 7.2

4u – 3u = 7.2

1u = $7.2

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