A woman comes home from the grocery store with three bags of Lay’s Potato Chips . . .
“These were on sale,” she says. “You buy three bags and each bag is $1.53. You know how much one bag is usually? $4.50. It’s like buying one bag and getting two bags free.”
“How much would it cost if we bought no bags of potato chips?” someone asks.
“That’s not an option.”