Analysis and Interpretation of Profitability Corporation follow. (b) Compute net operating assets (NOA) for 2018 and 2017. (c) Compute Costco's RNOA, net operating profit margin (NOPM) and net operating asset turnover (NOAT) for 2018. (d) Compute net nonoperating obligations (NNO) for 2018 and 2017. Confirm the relation: NOA =NNO+ Total equity. (e) Compute return on equity (ROE) for 2018 . (f) Infer the nonoperating return component of ROE for 2018