in response to complaints about high prices, a grocery chain runs the following advertising campaign: "If you pay your child $1 to go buy $30 worth of groceries, then your child makes about twice as much on the trip as we do." You've collected the following information from the grocery chain's financial statements: (millions) Sales $782.00 Net income 12.85 390.00 Total assets 159.50 Total debt a. What is the child's profit margin? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. What is the store's profit margini (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) c. What is the store's ROE? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) 106 Child's profit margin b. Store's profit margin % c Store's ROE %