Rozrywka kosztuje dziewięćdziesiąt złotych.

Rozrywka is a feminine noun. It can mean entertainment, amusement, fun, or recreation, depending on context.

In this sentence it is in the nominative singular, because it is the subject of the sentence.

A useful clue: many Polish nouns ending in -a are feminine, and rozrywka follows that pattern.

Because the subject is rozrywka, and rozrywka is singular.

Kosztuje is the 3rd person singular present tense form of kosztować.

So the structure is:

• rozrywka = the thing
• kosztuje = costs
• dziewięćdziesiąt złotych = ninety zlotys

The verb agrees with rozrywka, not with the number in the price.

Compare:

• Rozrywka kosztuje... = singular
• Bilety kosztują... = plural

The dictionary form is kosztować, which means to cost.

A few present-tense forms are:

• ja kosztuję = I cost
• ty kosztujesz = you cost
• on/ona/ono kosztuje = he/she/it costs
• my kosztujemy = we cost
• wy kosztujecie = you cost
• oni/one kosztują = they cost

In this sentence, kosztuje matches rozrywka.

Because after 90, Polish uses the noun in the genitive plural.

The basic noun is złoty. Its forms with numbers are:

• jeden złoty = 1 zloty
• dwa / trzy / cztery złote = 2, 3, 4 zlotys
• pięć złotych = 5 zlotys
• dziewięćdziesiąt złotych = 90 zlotys

A good rule of thumb:

• numbers ending in 2, 3, 4 usually take złote
• numbers ending in 5, 6, 7, 8, 9, 0 and the teens usually take złotych

So 90 takes złotych.

The base form is złoty.

This is the singular nominative form, the one you would find in a dictionary.

Useful forms:

• złoty = nominative singular
• złote = form used after 2, 3, 4
• złotych = genitive plural, used after 5+, teens, and numbers ending in 0

You will also often see the abbreviation zł.

Because Polish does not have articles like English a, an, and the.

So Rozrywka kosztuje dziewięćdziesiąt złotych can mean:

• Entertainment costs ninety zlotys
• The entertainment costs ninety zlotys

Context tells you which meaning is intended.

This is very normal in Polish, and learners usually just have to get used to understanding definiteness from context.

Because the verb kosztować takes the price directly.

So Polish says:

• To kosztuje sto złotych = This costs one hundred zlotys

You do not use a preposition here.

But in a different structure, Polish can use za:

• Kupiłem to za sto złotych = I bought it for one hundred zlotys

So:

• kosztować + amount
• kupić coś za + amount

That distinction is very useful.

Yes, Polish word order is more flexible than English, but the most neutral order here is:

• Rozrywka kosztuje dziewięćdziesiąt złotych.

This is a straightforward subject + verb + price order.

Other orders are possible, but they sound more marked or emphatic. For example:

• Dziewięćdziesiąt złotych kosztuje rozrywka.

This is understandable, but it is not the most neutral way to say it.

For learners, the best choice is to keep the original order unless you have a reason to emphasize something.

In modern Polish, ł is pronounced like English w.

So zł sounds roughly like zw.

That means złoty begins roughly like:

• zł- ≈ zw-

And złotych is roughly pronounced:

• ZWO-tikh

A couple of details:

• the y sound does not have an exact English equivalent
• the final ch is like the sound in German Bach or Scottish loch

So the spelling may look difficult, but the beginning is actually simpler than it seems: zł is basically zw.

Yes. In everyday writing, that is very common.

You could write:

• Rozrywka kosztuje 90 złotych.
• Rozrywka kosztuje 90 zł.

All of these are natural. The fully written-out version is a little more formal or textbook-like, while 90 zł is extremely common in real life.

The most natural question is:

• Ile kosztuje rozrywka? = How much does entertainment cost?

You can also turn the original sentence into a yes-no question just by using question intonation:

• Rozrywka kosztuje dziewięćdziesiąt złotych?

Polish often forms yes-no questions without changing the word order. Intonation does a lot of the work.