group range from $15.16 to $7.20 a ton. The next group, 10 to 25 tons per hour, has a 42 percent reduction in costs from the low to the high. These per ton costs range from $14.52 down to $5.53. The other two groups, 25 to 35 and 35 to 50 tons per hour, have an average of 16 and 19 percent, respec
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