The blond teenager has just graduated from high school and will soon be heading off to university.
As she comes from a poor family, she must work and take as many odd jobs as she can find, to pay for her university education.
So she goes around the neighbourhood, knocking on doors, and asking if her neighbours have any odd jobs she can do.
She knocks on the door of a grand old house in an adjoining neighbourhood. The people living there obviously have lots of money, she thinks, and she hopes they'll pay her generously.
The owner opens the door and the blond asks if he has any odd jobs to be done.
He thinks for a moment and responds that the porch needs painting. He offers her $20 to do the job and she accepts.
He shows her to the garage where the paint is located and leaves her to it.
When he gets back to the house, his wife asks who was at the door.
When he tells her that he has hired the blond to paint the porch for only $20, his wife is horrified.
"How could you do such a thing?" she says.
"You're such a cheapskate. That's a very big porch. It'll take her all weekend to paint it, and you're only paying her $20?! You should be ashamed of yourself."
"OK, OK," he says. "I'll pay her $100 for painting the porch."
About an hour later, the door bell rings and the man goes to see who's there.
It's the blond. She tells him she's finished the painting.
The man is surprised to see her after only an hour and says, "How can you possible be finished so soon?"
"It wasn't difficult at all. Can I have my $20 please?"
"Oh, and by the way," she adds with smile, pocketing the $20, "It isn't a porch (Porsche) at all. It's a Ferrari."
The moral of this tale? "You get what you pay for."