Brain squeezer #14
The area of the tiles in 1/6 the of the conservatory (1 huge square of the repeated pattern) is 25 and can be looked at alone as it is just repeated.
There are : 12 half black tiles
4 quarter black tiles
4 all black tiles
12x0.5 + 4x0.25 + 4 = 6 + 1 + 4 = 11
You can then just multiply up by 4 to get the percentage.As all the big tiles are identical this will be the same percentage of 44 across the whole conservatory.