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How to calculate how many skips I need to make to get a percentage.

i.e. Let's say I have 13 million apples and I am going through each one counting and every 10 apple I place it in a different bucket, at the end I end up with a bucket with 10% of the original number of apples.

How many apples do I need to skip to get 20% in the bucket?

How many do I need to skip to get n% in the bucket?

thanks.

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    yes sorry I made the change, still how do I get how many for 20%?2012-05-06

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