8/75 = 0.1066666.....
Therefore 8 is roughly 11% of 75.
Or you could figure it out this way...
\(\frac { n }{ 100 } \cdot 75=8\\ \\ 75n=800\\ \\ n=\frac { 800 }{ 75 } \\ \\ \therefore \quad n=10.67\quad \left( 2\quad dp \right)\)
Therefore, more precisely, 8 is roughly 10.67% of 75.