In response to complaints about high prices, a grocery chain runs the following advertising campaign: $$If you pay your child $$1$ to go buy $$32$ worth of groceries, then your child makes about twice as much on the trip as we do$.$ You$$ve collected the following information from the grocery chain$$s financial statements:

$($in millions$)$

Sales $ $762\mathrm{.}00$

Net income $11\mathrm{.}85$

Total assets $340\mathrm{.}00$

Total debt $154\mathrm{.}50$

What is the child$$s profit margin?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

What is the store$$s profit margin?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

What is the store's ROE?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$