A waste is to be treated aerobically in a complete mix reactor with no recycle. The initial waste concentration is 200 mg/l and the following constants have been determined: Ks=50 mg/l; k=5.0 days^-1; kd=0.06 days^-1; Y=0.60 Determine the minimum mean cell residence time, the mean cell residence time you would set for design. If the design value for the mean cell residence time is 2 days, what is the effluent substrate concentration, the substrate removal efficiency, the F-to-M ratio and the mass concentration of microorganisms in the reactor X?