A man buys a goat for $60
then sells if for $70
then he buys it back for $80
but sells it again for $90.
How much did he make?
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Let’s track the man’s transactions:
1. He buys a goat for $60, so he has -$60.
2. He sells the goat for $70, so he now has +$10.
3. He buys the goat back for $80, so he now has -$70.
4. He sells the goat again for $90, so he now has +$20.
So, the man made a profit of $10 + $10 = $20 in total.