Almost 98% People Fail Answering This Question.

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If a man buys a horse for $60, sells it for $70, buys it back for $80, and sells it again for $90, the trick is to approach each transaction as separate:

May be an image of money and text that says 'A man buys a horse for $60, sells it for $70, buys it back for $80, and sells it again for $90. How much money did he make or lose?'

-60 + 70 = 10
-80 + 90 = 10

The man made $10 with each transaction, therefore his profit adds up to $20.

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