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MMMski
I believe the answer is 29.67 (if I calculated correctly). However, it can easily round to $.30
There are 12 eggs in one dozen. 
Set up an equation
12eggs/0.89 = 4eggs/x
cross multiply and solve for x

or

just divide 0.89 by 3 because 4 eggs * 3 eggs = 12 eggs.

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