"How much do the pants cost?" is a common way to ask the price of pants in Engpsh.
来源：这是一种在英语中提问裤子价格的通用方式。
Examples:
"Excuse me, how much do these pants cost?"
"打扰一下，这些裤子多少钱？"
"Do you have any pants that are on sale? And if so, how much do they cost?"
"你们有没有打折的裤子？如果有，它们多少钱？"