In response to complaints about high prices, a grocery chain runs the following advertising campaign: $"$If you pay your child $$2$ to go buy $$40$ 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$,$$$660\mathrm{.}0$