A concrete column section of size 300 mm × 500 mm as shown in the figure is subjected to both axial compression and bending along the major axis. The depth of the neutral axis (X
u) is 1.1 times the depth of the column, as shown.
The maximum compressive strain (ε
c) at highly compressive extreme fiber in concrete, where there is no tension in the section, is ______ × 10
-3(rounded off to 2 decimal places).