Selected financial data for Surfer Co. is provided below: ($ in millions) Sales $ 940,000 Interest expense 3,000 Tax expense 21,000 Net income 54,000 Total assets (beginning of year) 900,000 Total assets (end of year) 820,000 Total liabilities (end of year) 600,000 Total stockholders' equity (end of year) 220,000 What is the return on assets for Surfer Co.? Group of answer choices 6.6%. 6.3%. 6.0%. 6.9%.