Buying items at a shop is a very important thing for beginners to learn.
怎么卖 is the same as 多少钱. Both are asking “How much?”.
斤 is a Chinese measurement of weight equivalent to half a kilogram.
小明：老板，请问桃子怎么卖？
老板：桃子18块一斤。
小明：桃子新鲜吗？
老板：刚从树上摘下来的，很新鲜，很甜。
小明：那我要这些，您看多少钱？
老板：26块。
小明：给您30。
老板：好的，找你四块钱。
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narration saved locally, offline — from https://hskreading.com/wp-content/uploads/2019/05/Level2.m4a
小明：Shopkeeper，How much are the peaches?
老板：18 yuan per half kilo.
小明：Are they fresh?
老板：Straight from the trees, very fresh and very sweet.
小明：Then I’ll take these. How much will that be?
老板：26 yuan
小明：Here’s 30.
老板：Ok, I will give you 4 yuan change.
https://hskreading.com/wp-content/uploads/2019/05/Level2.m4a