A lagoon with volume $1,100m^3$ has been receiving a steady flow of a non$-$conservative waste $($rate constant $=\frac{0\mathrm{.}26}{?}$ day$)$ at a rate of $80\frac{m^3}{?}$ day for a long enough time to assume that steady$-$state conditions apply. The waste entering the lagoon has a concentration of $18m\frac{g}{L}.$

A$.$ What would be the concentration of pollutant in the effluent leaving the lagoon?

B$.$ If the input waste concentration suddenly increased to $110m\frac{g}{L},$ what would the concentration in the effluent be $4$ days later?