Answer:
Hi!
The answer is: 1.804.000 cockroaches are immune.
Step-by-step explanation:
To solve this problem, you can use <em>the rule of three</em>.
100 ----> 2.200.000 cockroaches // If 100% is 2.200.000 cockroaches
82 ----> x cockroaches // then 82% will be immunes.
Now, multiply 82 by 2.200.000 and divide the result by 100:

<u>1.804.000 cockroaches are immune.</u>