i already know how to compute current ratio and times interest earned. but I do need help with knowing how to answer the rest of the questions in part a, b and c

Chapter 5 Analyzing and Interpreting Financial Statements 239 EXHIBIT 5.13 Industry Ratios: Medians of Companies with Market Capitalization > S500 Million (2012-2014 ROE ROA ROFL Apparel. . . . . . . . . . . . . . 16.3% 9.5% 5.4% Business Services ..... 9.9% 5.0% 3.7% Chemicals.......... 18.1% 8.1% 8.6% Computers ....... 9.8% 5.4% 4.0% Consumer Goods. .. 13.9% 8.3% 6.7% Food Products ........ 13.3% 7.0% 5.9% Healthcare ........... 11.7% .... 11.7% 5.9% 5.3% Petroleum 8.5% 5.3% 2.9% Pharmaceutical....... -3.1% -3.1% -1,1% Printing & Publishing ... 12.5% 5.7% 7.1% Restaurants, Hotel 14.5% 6.4% 6.7% Retail .... 14.6% 7.5% 6.0% Steel ...... 5.6% 3,4% 1.4% Telecommunications.... 12.1% 6,1% 5.2% Tobacco .......... 13,1% 14.2% 9.0% Transportation ........ 11.1% 5.5% 4.6% Utilities ........... 9.6% 4.1% 5.4% Overall ............. 11.0% 5.7% 5.3% 1 PM 10.3% 7.3% 9.9% 6.4% 9.5% 6.8% 6.1% 7.3% 1.3% 7.3% 5.9% 5.0% 1.8% 6.9% 30.1% 6.2% 6.3% 7.1% GPM 50.5% 64.7% 32.7% 52.5% 47.8% 32.4% 21.9% 45.4% 62.6% 55.5% 26.0% 34.0% 17.5% 51.2% 52.7% 30.0% 28.9% 34.6% AT ART INVT PPET DETIE 1.34 9.79 3.20 7 .87 0.48 32.36 0.81 5.64 28.30 10.52 0.83 9.22 0.98 6.535.17 3.13 1.43 8.95 0.91 5.52 7.16 11.00 0.70 12.44 1.16 7.19 5.446.67 1.05 14.37 1.24 12.26 6.294.80 1.25 7.48 0.98 7.39 44.73 4.74 1.49 4.39 0.68 6.83 15.94 0.44 1.13 3.87 0.44 5.85 2.394.48 0.63 3.50 0.73 6.58 19.827.62 1.525.45 1.25 30.37 55.46 2.37 1.27 6.12 1.99 46.25 5.40 6.77 1.04 9.75 0.98 7.68 5.26 2.84 1.19 3.44 0.56 7.13 25.51 1.65 1.79 3.38 0.72 40.01 3.34 7.84 2.15 9.36 0.81 10.24 32.27 1.00 1.36 4.22 0.40 7.47 13.55 0.46 2.32 3.12 0.87 7.19 5.48 4.77 1.25 7.35 CRQR OCFCL 2.84 1.54 0.75 1.80 1.62 0.48 2.18 1.24 0.54 2.07 1.71 0.45 1.70 1.11 0.43 1.82 0.88 0.52 1.52 1.16 0.60 1.26 0.84 1.10 4.14 3.50 0.11 1.32 0.91 0.43 1.02 0.66 0.78 1.70 0.63 0.51 2.34 1.22 0.42 1.14 0.91 0.69 1.02 0.49 0.49 1.33 1.09 0.69 0.93 0.59 0.66 1.81 1.190.48