Extracted text: In an industrial area, 101 tonnes of waste is generated per year. Of this waste, about 56 tonnes of energy intensive materials were recycled, 17 tonnes of organic wastes were composted to produce fertilizer, and the remaining waste was disposed to landfill. The substitution efficiencies of recycling and composting are 95%, and 70%, respectively. Determine the Zero Waste Index (ZWI) of this waste management system. (dont write % after the number. If ZWI is 80%, just write 80. Calculate answer to 0 decimal places)