Answer: Bert's salary didn't increase while Ernie's salary increased by 11 percent.
Step-by-step explanation:
645 / 580 = 1.11
Simple:
1.11 * 100 = 111
100 is a whole so we subtract 100 from 111 to get 11.
11% is our answer.
It doesn't look like Bert's salary changed, 520 =/ 520