To ask how much something costs in Engpsh, you can say "How much does it cost?" or "What is the price?" For example:
"How much does this shirt cost?"
"What is the price of this dress?"
To specify a certain amount of money, you can use the word "dollars" or the abbreviation "dollars" or "USD" after the number. For example:
"This shirt costs twenty dollars."
"This dress is forty-five dollars."
"I'd pke to buy this for 100 USD."
You can also use the word "price" as a noun to refer to the cost of something. For example:
"What is the price of this item?"
"I'm trying to find a good deal on a new laptop. Do you know the price of this one?"