Morales Incorporated sells padlocks. It reported an increase in net sales from $$3\mathrm{.}6$ billion in $2017$ to $$3\mathrm{.}9$ billion in $2018,$ and an increase in gross profit from $$1\mathrm{.}1$ billion in $2017$ to $$1\mathrm{.}3$ billion in $2018.$

$1$ Calculate each year$$s gross profit percentage. $($Round your answers to $1$ decimal place.$)$

$2$ The change in gross profit represents: