PepsiCo, Inc. reported the following figures for the year ending December 31, 2023:

23. 
    
    • Total Revenue: $87.3 billion
    • Cost of Sales: $45.6 billion
    • Operating Expenses: $27.4 billion Calculate: a) Gross profit margin. b) Operating profit margin. c) Net profit margin if the net income for the year is $12.5 billion.