One of the 10 computer manuals published by company T in 2005 was made for home computers. Exactly five of the advertisements released by company T featured those manuals written for home computers. Since 20 advertisements were released by company T in 2006, no more than one-quarter of them featured the computer manuals published by company T in 2005.
The statement 'None of the graphics used in the advertisements released by company T in 2006 were done by professional artists' allows the conclusion above to be properly drawn.