How many hours would it take to install $27$ exterior windows in a concrete wall that measures $300$ linear feet during the cold winter months if the productivity rate factor is $1\mathrm{.}5$ labour hours per window?

How many hours would it take to install $27$ exterior windows in a concrete wall that measures $300$ linear feet during the cold winter months if the productivity rate factor is $1\mathrm{.}5$ labour hours per window?

$1$ labour hour

$8$ labour hours

$11$ labour hours

$17$ labour hours

$18$ labour hours

$32$ labour hours

$41$ labour hours