A small lake is surrounded by agricultural land. The lake is 150 m long and 120 m wide. The average depth 30 m. The lake is fed by a small pollution-free stream having an average flow of 1.5 m3/s. A herbicide, Greatcrop, is detected at a concentration of 45.2 ug/L in the lake. Greatcrop degrades biologically with a rate constant of 0.22 day-1. Assuming that the lake is at steady-state conditions and completely mixed at the time of sampling, what would have been the mass input of herbicide (kg/d)