Compute and Interpret Coverage, Liquidity and Solvency Ratios Selected balance sheet and income statement information from Amazon for 2016 through 2018 follows. $ millions 2018 2017 2016 Net operating profit after tax (NOPAT) $11,307 Net income Operating profit Interest expense Cash from operating activities Current assets Current liabilities Cash and cash equivalents. Marketable securities Total debt $3,319 $2,633 10,375 3,124 2,442 12,794 4,229 4,312 1,332 797 455 31,645 18,916 17,719 77,354 62,003 47,154 64,288 54,410 41,187 32,703 21,138 19,914 9,785 10,778 6,846 22,085 23,258 7,232 167,527 135,249 85,904 Assets Liabilities 111,953 97,385 60,270 Equity 40,936 26,046 18,128 Net operating assets (NOA) 24,246 20,178 938 a. Compute profitability measures RNOA and ROE for 2018 and 2017. In which year are the measures stronger? Round answers to one decimal place (ex: 0.2345 23.5%). 2018 2017 RNOA ROE 50.9% 96 96 %