Say you got laid off and started to collect EI on Jan. 1 of
$2000/month in a calendar year. Suppose on May 1, you found
another job paying $8000/month and remained employed through
out the year. Since you earned income($64000) exceeds the
benchmark of $48000, therefore, you need to reimburse 4 x $
2000 = $8000 of EI you had collected from Jan. to April.