Real Life Math Problem; A Lesson Over Coffee at Dunkin Donuts

Okay, let me set the scene. I’m at the Dunkin Donuts drive-thru. I’ve ordered a medium hot coffee, light, and sweet.  It came to $2.16. I hand the kid $3.00. As he’s making change I find 20 cents (two dimes) and try to give it to him. He looks at me in a panic – my receipt already in his hand – shakes his head, and says: “No, it’s too late.”

I say, “No. No it isn’t.”

He says, “Okay” and hands me 75 cents. What?

Now it’s my turn to panic. Not because he gave me the wrong change but because he knew it was wrong and had no idea how to fix it. None. I could see it in his face.

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