It is 51.8%.
You get it in this way: (259/500) * 100.
I.e., 0.518 * 100 =51.8.
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500 million times 259 billion equals 129,500,000,000,000,000,000 (129.5 quintillion).
259/500
The answer is 387.5
40 percent out of 500 percent = 0.4 x 500 percent = 20 percent
518/1000 simplified is 259/500