A high$-$performance catalyst is being developed that can rapidly degrade organic matter in

wastewater $($measured as COD$).$ Experiments show that the COD removal reaction is second

order with respect to COD concentration and that the rate constant has a value of $k=0\mathrm{.}001$

$\frac{L}{m}g*sec.$ A batch experiment is performed with an initial COD concentration of $C_0=100$

$m\frac{g}{L}$ at time $t=$ zero. What would the COD concentration be $($in $m\frac{g}{L})$ after $t200$

seconds? Round your answer to $2$ digits past the decimal $($e$.$g$.,$ X$.$XX$)$ and do NOT enter

units.