In response to complaints about high prices, a grocery chain runs the following advertising campaign: $"$If you pay your child $$1\mathrm{.}25$ to go buy $$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:

$\backslash$table$[[($in millions$)],[$Sales$,$$$680\mathrm{.}0$

What is the profit margin for the child as a percentage of what they spend and the profit margin for the store?

What is the store's ROE?