This is the 2500th most frequent Polish word.
koszt
Cost.
Koszt is used as a noun meaning 'cost' to represent the monetary value associated with the trip.
Koszt tej wycieczki jest wysoki.
The cost of this trip is high.
Koszty, the plural form of 'koszt', refers to expenses or expenditures in the context of production.
Wysokie koszty produkcji są problemem dla wielu firm.
High production costs are a problem for many companies.
Koszty, used here in plural form, indicates the expenses we need to minimize for budgeting purposes.