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The packing process in a garment factory involves processing by 3 machines. The first machine, A, inserts the garment in a packet, after which the second machine, B, seals the packet and finally the third machine, C, attaches a price tag to the packet. Machine A takes at least 10 per unit. Machine B takes at least 15 per unit. Machine C takes at least 12 per unit. The factory starts at 8 am and runs non-stop till 6 pm, What is the maximum number of packets that can be processed in a one-hour period?