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: -60 + 70 = 10 -80 + 90 = 10 The man made $10 with each transaction, therefore his profit adds up to $20. Did you approach it differently? Let us know in the comments, and SHARE this problem to test your friends.
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