A girl bought a dog for $10, sold it for $15, bought it back for $20 and finally sold it for $25. Did the girl make or lose money, and how much did she make or lose?
Total money the girl spent to buy the dog = 10+20=30
Total money the girl got by selling the dog = 15+25=40
=> Total money the girl made = 40-30=10
So the girl made money and she made $10
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