$1$a$.$ An organization has $$100$M in revenues, purchases of $72,$ and a pre$-$interest and pre$-$tax profit of $$8$M $($NIBIT$).$ Determine the $\%$ improvement in profit $($NIBIT$)$ if purchase costs were reduced by $10\%.$ Round your answer to one decimal place, if applicable.

$1$b$.$ Refer to the figure below for initial performance numbers.

ROA Relationship Tree.jpg

A reduction of $12\mathrm{.}4\%$ on purchases was achieved by the purchasing group. What is the resulting ROA?

Enter your answer as a percentage without symbols. Round your result to $1$ decimal place, if applicable. $(15\mathrm{.}76\%$ is entered as $15\mathrm{.}8)$