Less than 5.8% people in the world can solve Rubik's cube. There are 6bn people in the world, according to Wikipedia there are about 350 million Rubik's cube sold till jan09 so even if we believe all the people who possess the Rubik's cube can solve it, the figure will still remain at 350mn or 5.8%
Sounds like a witty answer, until one logically concludes that cubes can be shared.
Ironically i think the number is still near 5%,, its easy if you have patience, are not a dumb as, and enjoy games like these.
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There are currently 10 people that have (in competition, recorded by the official World Cube Association [WCA]) solved the cube in exactly 1:00.00 seconds.
Something closer to the answer you are looking for:
2719 people that have entered competition have an average of 5 solves between 1:00.00 and 1:59.99.
2461 people have a recorded fastest time between 1:00.00 and 1:59.99
--Information found on worldcubeassociation.org