5. Starbucks Corporation, a global coffeehouse chain, presents the following financial data for the fiscal year ending September 30, 20XX:
   • Total revenue: $30 billion
   • Cost of goods sold: $10 billion
   • Operating expenses: $15 billion
   • Earnings before interest and taxes (EBIT): $5 billion
   • Interest expense: $500 million
   • Income tax expense: $1.5 billion

Determine the following financial ratios for Starbucks Corporation:

a) Operating profit margin b) Return on equity (ROE) c) Times interest earned ratio d) Tax rate ratio