A young man decides to buy a collector's baseball card. He pays $60 for it. After a month the value of the card has increased to $70 and he decides to sell it. But already a few days later he regrets his decision to sell the collector's item and he buys it again. Unfortunately he has to pay $80 to get it back so he loses $10. After a year of owning the baseball card he finally decides to sell it for $100. What is his overall profit?
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