Przedsiębiorca wyjaśnia zarówno koszt dostawy, jak i koszt odesłania.

Because some Polish masculine nouns end in -a, even though they refer to men or masculine roles. Przedsiębiorca is one of them.

So in this sentence:

• przedsiębiorca = nominative singular, the subject
• it behaves grammatically like a masculine-person noun, even though its dictionary form ends in -a

This is similar to words like:

• kolega = male friend
• mężczyzna = man

So the ending -a does not automatically mean the noun is feminine.

It means both ... and ...

In this sentence:

• zarówno koszt dostawy, jak i koszt odesłania = both the cost of delivery and the cost of sending it back / return shipping cost

This is a fixed correlative structure in Polish:

• zarówno X, jak i Y = both X and Y

It is fairly formal or neutral in tone, and very common in written Polish.

They are in the genitive case because they depend on koszt.

Polish often uses this pattern:

• koszt czego? = the cost of what?

So:

• koszt dostawy = cost of delivery
• koszt odesłania = cost of sending back / return

This is very similar to the English pattern cost of ..., except in Polish the relationship is shown by case rather than by a separate word like of.

Odesłania is the genitive singular form of odesłanie, a verbal noun meaning sending back, returning, or dispatching back.

It comes from the verb:

• odesłać = to send back

So:

• koszt odesłania literally means the cost of sending back

In consumer or online-shopping language, this often refers to the cost of returning an item.

Yes, Polish could say:

• zarówno koszt dostawy, jak i odesłania

That would still be understandable, and it means roughly both the cost of delivery and of return.

But repeating koszt:

• zarówno koszt dostawy, jak i koszt odesłania

makes the sentence clearer, more balanced, and slightly more formal. This kind of repetition is common in official, legal, or informational language.

Wyjaśnia is the 3rd person singular present tense of wyjaśniać.

So it means:

• explains
• clarifies
• sets out

Because Polish present tense can also be used in a general or habitual sense, this sentence may mean something like:

• The entrepreneur explains both the delivery cost and the return cost
• The entrepreneur clarifies both the cost of delivery and the cost of return
• The business owner is required to make both costs clear (depending on context)

In practical usage, wyjaśnia often sounds a bit more formal than plain explains.

The verb wyjaśniać is imperfective, which is normal here because the sentence states a general fact or ongoing action.

Compare:

• wyjaśniać = to explain, to be explaining, to clarify
• wyjaśnić = to explain successfully / to make clear completely

In a neutral present-tense statement, Polish usually uses the imperfective:

• Przedsiębiorca wyjaśnia... = The entrepreneur explains / clarifies...

If you used the perfective verb, it would not normally work as a regular present-tense statement, because perfective present forms usually refer to the future.

No, this is a very normal, neutral word order.

• Przedsiębiorca = subject
• wyjaśnia = verb
• zarówno koszt dostawy, jak i koszt odesłania = object phrase

So the sentence follows a straightforward pattern:

• Subject + verb + object

You could change the order for emphasis, but the given version is the most natural and neutral in many contexts.

Because Polish has no articles.

English says:

• the entrepreneur
• the cost
• a cost

Polish does not have separate words like the or a/an. Whether something is definite or indefinite is understood from context.

So:

• Przedsiębiorca can mean the entrepreneur or an entrepreneur
• koszt dostawy can mean the cost of delivery or just delivery cost

In this sentence, context makes it sound like a specific, understood entrepreneur/business.

Not exactly.

• przedsiębiorca = entrepreneur, trader, business operator, economic entity acting as a business
• sprzedawca = seller
• firma = company/business as an organization

In legal or consumer-rights language, przedsiębiorca is very common because it refers to the business party in a formal sense, not just the person who sells something at the moment.

So this sentence sounds a bit legal or regulatory, not especially casual.

They refer to two different directions of movement:

• dostawa = delivery to the customer
• odesłanie = sending the item back

So the sentence contrasts:

• the cost of receiving the item
• the cost of returning the item

This kind of pairing is very common in e-commerce, consumer-law, and returns-policy language.

Yes, in many cases the whole structure zarówno ..., jak i ... is translated naturally as both ... and ..., and the jak i part functions a bit like and inside that structure.

But jak i by itself is not just a simple everyday and in all contexts. In this sentence, it is part of the fixed pair:

• zarówno ... jak i ...

So it is best learned as one complete expression rather than word by word.

Yes, it sounds fairly formal and informational.

Reasons:

• przedsiębiorca is a formal/legal word
• wyjaśnia sounds more official than a casual verb like mówi
• the structure zarówno ..., jak i ... is common in formal writing
• repeating koszt also adds to the formal tone

This sounds like something from:

• consumer information
• regulations
• terms and conditions
• official guidance on online purchases