Moolah Coin 04

Once upon a time, there was a gold coin with a cute Martian engraved on it. The coin was very popular among the people of Mars and everyone wanted to have one. However, the supply of coins was limited and so they were very valuable. One day, a man decided to sell his gold coin in order to buy some food for his family. He went to the market and found a buyer who offered him a good price for it. The man agreed and handed over the coin. The buyer then took out another gold coin from his pocket and showed it to the seller. "See this? It's an even better coin than yours! I'll give you twice the amount you paid me." The seller was so happy that he accepted immediately without thinking too much about it. Little did he know that he had just been tricked!