Question

A man buys a goat for $60

Then he sells it for $70
Then he buys it back at $80, but he sells it again for $90.
How much money did he make?

Answer 1

-60 + 70 - 80 + 90
He made twenty dollars

Answer 2

I believe it would be $10. He profited $10 but then lost. Later, he gained it again.