This is the 17408th most frequent Polish word.
zarobi
"Zarobi" means "he/she will earn" or "he/she earns" (depending on context).
The verb 'zarobi' is used in its future tense to depict earning or obtaining something valuable, typically money.
On zarobi dużo pieniędzy w tym miesiącu.
He will earn a lot of money this month.
'Zarobiłaś' is a form of 'zarobi' in the past tense and second person singular, questioning the earnings accumulated in a past activity.
Jak dużo zarobiłaś na tej pracy?
How much did you earn from this job?
Here, 'zarobi' is part of an infinitive clause expressing purpose or a required action to achieve sustenance.