Computing Return on Equity and Return on Assets

The following table contains financial statement information for OMV Group, which is a petrochemical company headquartered in Vienna.

Required

a$.$ What was OMV Group's return on assets $($ROA$)$ for $2016,2017,$ and $2018?$

b$.$ Determine its profit margin $($PM$)$ for each of the three years $2016-2018.$

c$.$ Determine its asset turnover $($AT$)$ for each of the three years $2016-2018.$

Notes:

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

Round AT answers to two decimal places $($ex: $0\mathrm{.}56789=0\mathrm{.}57).$

Use negative signs with answers, when appropriate.

d$.$ What factor is mainly responsible for the change in OMV's ROA from $2016$ to $2017?$ Is it profit margin or asset turnover or both?

e$.$ What factor is mainly responsible for the change in OMV's ROA from $2017$ to $2018?$ Is it profit margin or asset turnover or both?

f$.$ Determine OMV Group's return on equity $($ROE$)$ for each of the three years $2016-2018.$

Notes:

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

Use negative signs with answers, when appropriate.