Combining probability

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Suppose that I have nine chicken eggs and three turkey eggs and suppose each egg has a 100% chance of hatching successfully, what is the chance a given egg will successfully hatch a turkey and please show me how to arrive at that answer.
Now suppose that I still have nine chicken eggs and three turkey eggs but this time each egg only has a 50% chance of hatching, how do I calculate that an egg will successfully hatch a turkey?