Please answer the following questions: Computing, Analyzing, and Interpreting Return on Equity and Return on Assets

Following are summary financial statement data for Logitech International for $2016$ through $2018.$

a$.$ Compute the return on assets $($ROA$)$ for $2018$ and $2017.$

Round answers to one decimal place $($ex: $0\mathrm{.}2345=23\mathrm{.}5\%).$

b$.$ Compute the profit margin $($PM$)$ for $2018$ and $2017.$

Round answers to one decimal place $($ex: $0\mathrm{.}2345=23\mathrm{.}5\%).$

c$.$ Compute the asset turnover $($AT$)$ for $2018$ and $2017.$

Round answers to two decimal places.

d$.$ Which component of ROA $($profit margin or asset turnover or both$)$ drives the change in ROA in $2018?$

e$.$ Compute the return on equity $($ROE$)$ for $2018$ and $2017.$

Round answers to one decimal place $($ex: $0\mathrm{.}2345=23\mathrm{.}5\%).$

f$.$ Logitech repurchased common shares in $2018$ at a cost of $$30$ million. Did this repurchase increase or decrease the company's ROE?