The price per egg in a tray is $12/30 eggs = $<<12/30=0.4>>0.4/egg.

The equivalent of $0.4 in cents is $0.4 x 100 cents/dollar = <<0.4*100=40>>40 cents.

Hence, you can save 50 cents - 40 cents = <<50-40=10>>10 cents per egg if you buy a tray.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The price per organic egg is 50 cents. The price of a tray of eggs that contains 30 eggs is $12. How much can you save, in cents, per egg if you buy a tray versus individual eggs?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
10
The price per organic egg is 50 cents. The price of a tray of eggs that contains 30 eggs is $12. How much can you save, in cents, per egg if you buy a tray versus individual eggs?
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