A man buys 100 oranges for Rs. 400. 20 oranges are rotten and thrown away. At what rate per dozen should he sell the remaining oranges to gain 20% on the whole transaction?
A man buys oranges at 5 for Rs. 10 and an equal number at 4 for Rs. 10. He mixes them and sells the mixture at 9 for Rs. 20. Find his profit or loss percentage.
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