In response to complaints about high prices, a grocery chain runs the following advertising campaign: "If you pay your child $5 to go buy $50 worth of groceries, then your child makes twice as much on the trip as we do." You've collected the following information from the grocery chain's financial statements: ($ in millions) $570.0 Sales Net income 28.5 Total assets 470.0 Total debt 340.0 What is the profit margin for the child as a percentage of what they spend and the profit margin for the store? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16. What is the store's ROE? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) . b. a. Child's profit margin Store's profit margin % Store's ROE b