A $500MW$ power plant is burning coal that has a heating value of $23,500k\frac{J}{k}g,$ and ash content of $9\%.$ The plant has an overall thermal efficiency of $37\mathrm{.}5\%.$ Assume that $20\%$ of the ash falls out in the bottom of the furnace and the rest goes out with the flue gases as fly ash. If an electrostatic precipitator $($ESP$)$ with $99\mathrm{.}4\%$ efficiency treats the flue gas stream, the rate of fly ash emissions to the atmosphere in $k\frac{g}{?}$ day is most nearly: