How much money would It cost for a trip at Europe? ?

So me and my sister are planning to go to Europe pretty soon I was just wondering how much money should we save up!! We need to now how much will it be with plane tickets trains hotels shopping and all the tourist stuff?? Also we might stay over there for about 3 weeks the most! We still don't know we're... show more So me and my sister are planning to go to Europe pretty soon I was just wondering how much money should we save up!! We need to now how much will it be with plane tickets trains hotels shopping and all the tourist stuff?? Also we might stay over there for about 3 weeks the most! We still don't know we're planning to go but were planning to visit the most 5 cities
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