Determining Supply from a Value Scale (hint)
Since Smith owns three cows, he will be most willing to sell his third, least-valued cow. What is the lowest price that would have greater utility to Smith than this third cow?

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Smith
     26 hens
    
1st cow
    
25 hens
     24 hens
     23 hens
    
2nd cow
    
22 hens
       . . .
     19 hens
    
3rd cow
    
18 hens
       . . .
     12 hens
    
4th cow
    
11 hens
     10 hens
     9 hens
    
5th cow
    
8 hens
       . . .
     5 hens
    
6th cow
    
4 hens
    
7th cow
     8th cow
    
3 hens
    
9th cow
    
2 hens
    
10th cow
    
1 hens
    
11th cow
    
  . . .
  stock:
 3 cows,
100 hens