Apple Inc.

• Net Sales: $365,783 million
• Cost of Goods Sold: $220,086 million
• Gross Profit: $145,697 million
• Operating Expenses: $55,708 million
• Operating Income: $89,989 million
• Interest Expense: $2,051 million
• Income Before Taxes: $87,938 million
• Income Tax Expense: $18,629 million
• Net Income: $69,309 million

a. Compute Apple Inc.'s gross profit margin. b. Determine the operating income margin for Apple Inc. c. Discuss the impact of Apple Inc.'s interest expense on its profitability. d. Analyze how Apple Inc.'s net income compares to its historical performance.