If 750 million people saw a advertisement to donate 25 dollars to your paypal account what are the how many people out of 750 ML would do it what are the odds?
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If it was just to donate 25 dollars, I would say that you would probably be very little of those people, like 100 people *maybe.* Of course, there is no real way to calculate the actual odds for who will do it. Factors such as Good advertising, that they will get something, or that it will go to a good cause, will make the odds better that they will donate, just don't go over the top.