I used the 2nd table which provides a straight histogram of the number of individuals in a particular income range. Per capita doesn't come into it at all.
The household income table is much more difficult to interpret in this context.
Getting straight facts often takes a little effort. If you are not using per-capita income, you are throwing around numbers with no cited baseline. What is the top 1% for the numbers that you are using (with references)?
You have provided no credible sources for those figures at a global level. You started off with some random $50,000/yr figure and are comparing that to a completely different population group (wage earners). Apples::Oranges.
Here is another reference: http://www.dailymail.co.uk/news/article-2082385/We-1--You-need-34k-income-global-elite--half-worlds-richest-live-U-S.html. Note that they are using "after tax" income ($34,000), which throws even more confusion into the mix. They claim that 48% of the global 1% live in the U.S.
If 48% of the richest 1% live in the US, we can see that 1% of 7B (global population) is 70M. 70M * 48% = 33.6M. Of the 300M US population, 33.6M are in the global 1%. That matches pretty closely (11.2%) with my earlier figures. And rather far off from 25%.