hi Expected Boots Market Opportunity by $2023$:

$5\mathrm{.}2\%$ of $336$ million units $=17\mathrm{.}4$ million units

So$,$ the expected market opportunity for Bootwork Shoes in $2023$ is $2\mathrm{.}66$ billion units, or $17\mathrm{.}4$ million units $*152$ units$/$billion units.