In response to complaints about high prices, a grocery chain runs the following advertising campaign: "If you pay your child $6 to go buy $100 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 (millions) Sales Net income Total assets Total debt $620.0 18.6 350.0 220.0 What is the profit margin for 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.) Profit margin Child Store 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.) ROE