Edison's famous words are as follows:
Genius is one percent inspiration and ninety-nine percent perspiration.
O oral presentation (C.1903); Published in Harper's Monthly (September 1932)
O variant:
None of my inventions is accidental. I saw a demand worth meeting, and I tried again and again until it came true. It boils down to one percent inspiration and ninety-nine percent perspiration.
+Statement at the press conference (1929), quoted from Unusual Friends: With Thomas Edison, Henry Ford, Harvey firestone, Alexis Carrel & Charles Lindbergh (1987) by James Newton, p. 24.
O There is no variant quoted in advance: "Genius is one percent inspiration and ninety-nine percent perspiration. Therefore,' genius' is usually just a genius who has done his homework. "
"Genius: One percent inspiration and ninety-nine percent perspiration."
Therefore, "Genius is one percent inspiration and 99 percent inspiration" is the correct solution.