Asset turnover ratio is defined as sales$/$total assets. Suppose Bentley Oil maintains an operating profit margin of $5$ percent and asset turnover ratio of $3.$ Calculate its ROA. If its debt$-$equity ratio is $1\mathrm{.}0,$ its taxes are $$8000,$ and EBIT is $$20,000,$ what is its ROE? d$.$ What does the reserve life index tell you?