$In2012,34\mathrm{.}1\%of$ all glass containers were recycled. A beverage company used $300,000lbof$ glass containers per year.

After recycling, the amount $of$ glass, $in$ pounds, still $in$ use after $t$ years $is$ given $byN(t)=300,000(0\mathrm{.}324{)}^t.$

$aN(4),$ and explain its meaning.

$b{N}^{\text{'}}(4),$ and explain its meaning.

$c8\%of$ the original amount $of$ glass still $bein$ use?

$aN(4)=,lb$

$(Roundto$ two decimal places $as$ needed.$)$