yes, they are the same meaning. 這個杯子怎麼賣means 'what's the price for this the cup'.
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這個杯 子多少錢? -> This cup how much? -> How much is this cup?
這個杯子怎麼賣? ->This cup how you sale it? -> How much will you sale this cup? -> How much is this cup?
2015年2月28日
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yes,in this sentence, they have the same meanings.