I'm very lost can you please help me answer a-d with an explanation? Thank you

(Amounta Expresoed in Milliona) For the Fiseal Yeara Ended September 30 and September 24, respectively: Net ale: Coat: of alea Operating insome Net income At Year End: Aosets Current aswets: Cash and cash equivalent: Short-term marketable securitie: Accounta receivable, leas allomances of $58 and $53, respectively Inventories Veador ncatrade receivable: Other current aisets Total current asiet: Long-term marketable securities Property, plant, and equipment, net Ooodmill Acquired intangible asiets, aet Other asat: Total ascet: Liabilitien and Shareholderv' Equity Current liabilitie: Accounta payable Accrued expen:e: Deferred revenue Commercial paper Current portion of long-term debt Total current liabilitie: Deferred sevenus-noncurrent Long-term dabt Other acucurrent liabilitie: Total liabilitie: Shareholder:" equity: Retained earning: Aocumulated other comprehen:ive inoome (low) Total shareholder:" equity Total liabilities and shareholder:" equity: tively: 2017 2016 $229,234$215,639 114,048 131,376 61,344 60,024 $48,351 845,687 8 45,687 \begin{tabular}{rr} $49,049 & $37,294 \\ 25,744 & 22,027 \\ 7,548 & 8,080 \\ 11,977 & 8,105 \\ 6,496 & 3,500 \\ \hline 100,814 & 79,006 \\ 2,836 & 2,930 \\ 97,207 & 75,427 \\ 40,415 & 36,074 \\ \hline 241,272 & 193,437 \\ \hline \end{tabular} \begin{tabular}{rr} 35,867 & 31,251 \\ 98,330 & 96,364 \\ (150) & 634 \\ 134,047 & 128,249 \\ \hline$375,319 & $3321,686 \\ \hline \end{tabular} 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. Round your ratio answers to two decimal places. b. Calculate Apple's ROE for the years ended September 30, 2017, and September 24, 2016. Round your percentage answers to one decimal place. c. Calculate Apple's ROI, showing margin and turnover, for the years ended September 30, 2017, and September 24, 2016. Round your turnover calculations to two decimal places. Round your margin and ROI percentages to one decimal place. d. Evaluate the company's overall liquidity and profitability