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Big Allowance

In case you'd like another one of those:

When I was a child I once asked my father if, instead of giving me my weekly one dollar allowance, he would switch to giving me one cent the first week, double it and give me two cents the next week, double it again and give me four cents the next week, and continue doing that for a year. He was smart enough that he did not fall for that trick, but if he had, how much would he have had to pay me over the course of the year?

Answer:
Answer: In round figures, $45 trillion. (A few billion more, but I would have let him keep the change!) Once again, you can easily calculate this using a spreadsheet program.