"Vi devas labori pli, se vi volas havi pli da mono."
Translation:You have to work more, if you want to have more money.
Not necessarily true. If you work smart or invest money you already have, you can make more money without working hard.
Not all Duolingo sentences are supposed to be necessarily true. This is something more like what your boss would say.
Interesting here how its pli da mono. Its like the latin construct, plus (indeclinable) + genetive. more of ___. E.g. plus vini, more of the wine.