In a plant where coal is burned as fuel, the flue gas contains coarse, medium and fine particulate matter. The particulate in any size is present in equal amounts by weight in the gas stream. 1.2 kg of particulate matter per hour is discharged from the stack. In the treatment unit, coarse particles are removed by 99%, medium particles by 80% and fine particles by 20%. If a treatment unit with the same characteristics is added to this treatment unit by adding it in series, what is the total treatment efficiency of the system?

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