All State Trucking Co. has the following ratios compared to it industry for 2007:
                                                                           AllState Trucking          Industry
Return on sales                                                         3%                          8%
Return os assets                                                     15%                          10%  
Explain why the return-on-assets ratio is so much more favorable than the return-on-sales ratio compared to the industry.  Nu numbers are necessary; a one-sentence answer is all that is required.