please do quickly

Determine the following ratios for year 2015. a) Determine the current ratio and interpret. b) Determine the days' sales in receivables and interpret. c) Determine the times interest earned ratio and interpret. d) Determine the profit margin and interpret. e) Can a firm profit by lowering its sales (price) and the its profit margin? f) Determine the ROE in two way (one by using the Du Pont identity)