A publisher printed 3000 copies of ‘Future Shock’ at a cost of Rs2400. He gave 500 copies free to different philanthropic institutions. He allowed a discount of 25% on the published price and gave one copy free for every 25 copies bought at a time. He was able to sell all the copies in this manner. If the published price is Rs3.25, what is his overall gain or loss percentage in the whole transaction?
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