Riddle: A man buys a goat for $60. Then, he sells it for $70. Then, he buys it back at $80 but sells it again for $90. How much did he make?
The man made $20.
The first time he made $70 – $60 = $10.
The second time he made $90- $80 = $10.
Therefore, he made a total of $20.
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