You know Ilf and Petrov rule, dont you? I tryed to check, if it is always true or not.
Suppose I’m working for 30 hours per week and I get 10$ per work hour. In this case I’ll earn 1200$ per month. If I worked for 40 or 50 hours per week for the same fee I’ll manage to earn 1600$ or even 2000$.

Besides if I’m working for 30 hours per week I can sell some time for freelance and get some extra money. So it seems that Ilf and Petrov were right with one slight exception.
EXCEPION: If I’m told to work extra time without having any extra fee, Ilf and Petrov rule is not working.