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One day, a young man came to Mr. Wang's store and bought a gift. The cost of the gift was 18 yuan, and it was priced at 21 yuan.
The young man took out a 100 yuan note to buy the gift; Empire Prom Dresses. Since Mr. Wang did not have change at the time, he exchanged the 100 yuan note with a neighbor for loose change, christian louboutin sample sale, and gave 79 yuan back as change to the young man.
However, later the neighbor discovered that the 100 yuan note was counterfeit, leaving Mr. Wang no choice but to return 100 yuan to the neighbor.
How much money did Mr. Wang lose?