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Questions & Answers about Qual é o preço?
Why does this sentence use Qual instead of the Portuguese word for "what"?
Could I use Quanto (how much) to ask this?
Does Qual change if the noun is feminine or plural?
Why do we need the article o before preço?
In Portuguese, it is standard to include the definite article (o or a, meaning "the") before the noun in these types of questions. You are asking for a specific thing, so it translates literally as "Which is the price?".