Paolo can walk three dogs or mow two lawns in two hours. Ashanti can walk six dogs or mow three lawns in two hours. Ashanti's opportunity cost for each additional dog walked is:

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Ashanti can mow 3 lawns or walk 6 dogs in two hours. The opportunity cost of walking one dog is the number of lawns she could have mowed instead. Since she can mow 3 lawns in the time it takes to walk 6 dogs, the opportunity cost of walking one dog is 3 lawns / 6 dogs = 0.5 lawn per dog.

Paolo Can Walk Three Dogs or Mow Two Lawns in Two