Det ser ut til at yoghurt og epler er billigere i dag.

Here, det is a dummy subject. It does not refer to a specific thing like it often does in English.

In the expression det ser ut til at ..., Norwegian uses det to introduce the idea:

• Det ser ut til at ... = It seems that ...
• literally, something like It looks like that ...

So in this sentence, det is just part of the fixed structure and does not mean a particular object.

Ser ut til at is a very common Norwegian expression meaning:

• it seems that
• it looks like
• it appears that

So:

• Det ser ut til at yoghurt og epler er billigere i dag. = It seems that yogurt and apples are cheaper today.

You can think of it as a chunk:

• det ser ut til at = it seems that

This is more natural than translating each word one by one.

At is a subordinating conjunction meaning that.

It introduces the clause:

• at yoghurt og epler er billigere i dag

So the sentence is built like this:

• Det ser ut til
  • at
    • clause

Compare:

• Jeg vet at han kommer. = I know that he is coming.
• Det virker som at hun er trøtt. = It seems that she is tired.

In everyday English, that is often omitted, but in Norwegian at is commonly kept in sentences like this.

Because billigere is the comparative form of billig:

• billig = cheap
• billigere = cheaper
• billigst = cheapest

The sentence is comparing today’s price with some other time, usually the normal price or a previous day.

So:

• billig = cheap
• billigere i dag = cheaper today

Even though the sentence does not say exactly than before, that comparison is understood from context.

Because the adjective describes the whole combined subject:

• yoghurt og epler = yogurt and apples

In English, we also do this:

• Yogurt and apples are cheaper today.

Norwegian does the same thing. One comparative adjective can describe both nouns together.

Also, comparative adjectives like billigere do not change for plural here. You do not need a special plural form.

In Norwegian present tense, the verb form does not change according to person or number.

So:

• jeg er
• du er
• han er
• vi er
• de er

It is always er in the present tense.

That is why:

• yoghurt er billig
• epler er billige
• yoghurt og epler er billigere

The verb stays er whether the subject is singular or plural.

Because epler is the plural form of eple:

• et eple = an apple
• epler = apples

But yoghurt is often used as an uncountable/mass noun, like milk or rice, especially when talking about yogurt in general rather than individual cups.

So:

• yoghurt = yogurt, yogurt in general
• epler = apples, countable items

If you wanted to talk about individual yogurts, you might say something more specific, depending on context, such as yoghurter or use a phrase with packaging or portions, but in ordinary shopping language yoghurt as a mass noun is very natural.

Because i dag is a time expression, and in a sentence like this it often comes naturally toward the end.

The clause is:

• yoghurt og epler er billigere i dag

Basic structure:

• subject: yoghurt og epler
• verb: er
• complement: billigere
• time expression: i dag

This is very normal Norwegian word order.

You could move i dag for emphasis in some contexts, but the given version is neutral and natural.

Yes. I dag is the standard expression for today.

Examples:

• Jeg jobber i dag. = I’m working today.
• Det er kaldt i dag. = It is cold today.

Notice that it is two words:

• i = in
• dag = day

But together they simply mean today.

Yes. If the speaker is more direct, they could say:

• Yoghurt og epler er billigere i dag.

That means:

• Yogurt and apples are cheaper today.

The version with det ser ut til at is softer and more cautious. It suggests the speaker is judging from what they see, rather than stating it as a hard fact.

So the difference is roughly:

• Yoghurt og epler er billigere i dag. = direct statement
• Det ser ut til at yoghurt og epler er billigere i dag. = it seems/it looks like they are cheaper today

Ser by itself usually means sees or looks in a direct visual sense:

• Jeg ser bilen. = I see the car.

But ser ut til is part of an idiomatic expression meaning seems / appears / looks like:

• Det ser ut til å regne. = It looks like it’s going to rain.
• Det ser ut til at han er hjemme. = It seems that he is at home.

So you should learn ser ut til as a phrase, not as just the verb se plus random extra words.

Good question. Both patterns exist, but they are used differently.

1. Det ser ut til at + clause

   • followed by a full clause with its own subject and verb
   • Det ser ut til at yoghurt og epler er billigere i dag.

2. Det ser ut til å + infinitive

   • followed by an infinitive verb
   • Det ser ut til å bli dyrere i morgen. = It looks like it’s going to become more expensive tomorrow.

So:

• til at
  • full clause
• til å
  • infinitive

That is the key difference.

Yes. Og simply means and, and it can join two nouns even if one is more like a mass noun and the other is countable:

• yoghurt og epler
• brød og melk
• ost og tomater

This is completely natural. The sentence is just listing two things that share the same description: they are cheaper today.