Halliburton and Schlumberger compete in the oil field services sector. Refer to the following 2018 financial data for the two companies to answer the requirements. HAL SLB $23,995 $32,815 Total revenue Pretax net nonoperating expense Net income 653 426 1,657 2,177 23,361 67,836 5,888 16,499 Average operating assets Average operating liabilities Marginal tax rate Return on equity 22% 19% 18.56% 5.86% a. Compute return on net operating assets (RNOA) for each company. b. Disaggregate RNOA into net operating profit margin (NOPM) and net operating asset turnover (NOAT) for each company