Prepare a commentary on the Profitability Ratios for Rolls-Royce plc and identify any additional information an analyst may require to make an assessment on the companys future profitability. 2016: 

Return On Shareholders Funds (ROSF) = -248.71% 

Return On Capital Employed (ROCE) = 0.26% 

Net profit margin = 0.27% 

Gross Profit Margin = 20.38% 

2015: Return On Shareholders Funds (ROSF) = -26.73% 

Return On Capital Employed (ROCE) = 10.61% 

Net profit margin =10.94% 

Gross Profit Margin =23.88%