In response to complaints about high prices, a grocery chain runs the following advertising campaign: "If you pay your child $2 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: (millions) Sales Net income Total assets Total debt $ 680.0 $ 13.6 $410.0 $280.0 What is the profit margin for child and store? Profit margin Child Store What is the store's ROE? (Round the final answer to 2 decimal places.) ROE 0 %