A rectangular bar with a circular hole is to be made of a material with actual maximum permissible stress of 150 Mpa. If stress concentration factor for the configuration is 3.0, what is the nominal average stress for sizing the section?

A rectangular bar with a circular hole is to be made of a material with actual maximum permissible stress of 150 Mpa. If stress concentration factor for the configuration is 3.0, what is the nominal average stress for sizing the section?