给大家出一道思维的题
做对了就说明你具备一定的逆向思维，听说只有20%的人能算出正确答案
王老板花30元进了一双鞋，零售价40元，一个小伙纸拿着100元（假的）来买鞋，王老板找不开，找邻居换了这100元，然后找给小伙纸60元，后来邻居发现这个100是假的，没办法王老板又还了邻居100，王老板究竟损失了多少钱~请在评论区留下你的答案
Edited 10 Dec 2019, 13:41
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