Luxury Vehicle Puns

Our teacher used to love that joke - 25 years ago...

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A veteran maths teacher on a crap state-paid salary leaves his local mall and heads for his battered old car. When he has nearly reached it, he sees a big, expensive, luxury vehicle pulling into a parking spot nearby, and when the driver gets out he recognises him as one of the stupidest students he ever had.

He approaches him and the two get chating; and it turns out the guy buys and sells specialised cardboard-boxes which companies use to ship delicate goods in.

Finally the teacher says: "You really seem to have done well for yourself. I must admit that I am a bit surprised. Because you never really were all that talented in shool, were you?"

And the guy smiles and answers: "Yes, well, you know, there is not that much too it, really. I buy cardboard boxes for 1 dollar a piece, and I sell them for 4 dollars a piece. And I live off that 3% profit margin."