A man buys a firework for Rs. 600, then he sells it for Rs. 700, then he buys it back for Rs. 800 but sells it for Rs. 900.

How much money did he make?

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A man buys a firework for Rs. 600, then he sells it for Rs. 700, then he buys it back for Rs. 800 but sells it for Rs. 900.

How much money did he make?

...