The following summarized data (amounts in millions) are taken from the September 30, 2017, and September 24, 2016, comparative financial statements of Apple Inc., a company that designs, manufactures, and markets mobile communication and media devices and personal computers, sells a variety of related software, services, accessories, networking solutions, and offers third-party digital content and applications: (Amounts Expressed in Millions) For the Fiscal Years Ended September 30 and September 24, respectively 2017 2016 Net sales $ 229, 234 $ 215, 639 Costs of sales 114,048 131,376 Operating income 61,344 6e,024 Net income $ 48,351 $ 45,687 At Year End: Assets Current assets: Cash and cash equivalents $ 20,289 $ 20,484 Short-term marketable securities 53,892 46,671 Accounts receivable, less allowance of $58 and $53, respectively 17,874 15,754 Inventories 4,855 2,132 Vendor nontrade receivables 17,799 13, 545 Other current assets 13,936 8,283 Total current assets 128,645 106,869 Long-term marketable securities 194,714 170,430 Property, plant, and equipment, net 33,783 27,010 Goodwill 5,717 5,414 Acquired intangible assets, net 2,298 3,206 Other assets 10,162 8,757 Total assets $375,319 $ 321.686 Liabilities and Shareholders' Equity Current liabilities: Accounts payable $ 49,049 $ 37,294 Accrued expenses 25, 744 22,027 Deferred revenue 7,548 8,080 Commercial paper 11,977 8,10 Current portion of long-term debt 6,496 3, 500 Total current liabilities 100,814 79,006 Deferred revenue-noncurrent Long-term debt 2,836 2,930 97,207 Other noncurrent liabilities 75,427 40, 415 36,074 Total liabilities 241, 272 193,437 Shareholders' Equity 17,799 13,936 128,645 194,714 33, 783 5,717 2,298 10,162 $ 375, 319 13,545 8,283 106,869 170,430 27,010 5,414 3,206 8,757 $ 321,686 Vendor nontrade receivables Other current assets Total current assets Long-term marketable securities Property, plant, and equipment, net Goodwill Acquired intangible assets, net Other assets Total assets Liabilities and Shareholders' Equity Current liabilities: Accounts payable Accrued expenses Deferred revenue Commercial paper Current portion of long-term debt Total current liabilities Deferred revenue-noncurrent Long-term debt Other noncurrent liabilities Total liabilities Shareholders' Equity Common stock and additional paid-in capital, $0.9901 par value, 12,600,000 shares authorized; 5,126,201 and 5,336,166 shares issued and outstanding, respectively Retained earnings Accumulated other comprehensive income (loss) Total shareholders' equity Total liabilities and shareholders' equity $ 49,049 25, 744 7,548 11,977 6,496 180,814 2,836 97,207 40, 415 241, 272 $ 37, 294 22,027 8,888 8,105 3,5ee 79, 806 2,93e 75,427 36,074 193,437 35,867 98,330 (150) 134, 847 $ 375, 319 31, 251 96,364 634 128, 249 $ 321,686 At September 26, 2015, total assets were $290,345 and total shareholders' equity was $119,355. Required: a. Calculate Apple Inc's working capital, current ratio, and acid-test ratio at September 30, 2017, and September 24, 2016 b. Calculate Apple's ROE for the years ended September 30, 2017, and September 24, 2016 c. Calculate Apple's ROI, showing margin and turnover, for the years ended September 30, 2017, and September 24, 2016