A lake with constant volume 1.2106m3 is fed by a stream with a non-conservative pollutant of 1.0mg/L and flow rate 5m3/s. A factory dumps 0.5m3/s of waste with 220 mg/L of the same non-conservative pollutant into the lake. The pollutant has a first order decay coefficient K of 0.20 /day. Assuming the lake is well mixed, find the steady-state concentration of pollutant in the lake