3) Sushant is selling chocolates at a rate of 5 Rs per chocolate and the size of the packet is 100 chocolates. He can increase the size of the packet by adding the chocolates in the multiples of 20. For every 20 additional chocolates he has to reduce the price by 0.2 Rs per chocolate. What should be the size of a packet such that the revenue is maximum? (a) 200 (b) 300 (c) 400 (d) 500 (e) 600
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400...............................
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