Answer:
$30,000 decrease.
Step-by-step explanation:
If the Alligator segment is eliminated, the $180,000 contribution margin ($600,000 - $420,000) will be eliminated but only $150,000 ($300,000 x .50) of the fixed costs will be eliminated resulting in a decrease of $30,000 net income ($150,000 fixed cost - $180,000 contribution margin).