a) Permissible Stress = Yield Stress x Factor of Safety
b) Permissible Stress = Yield Stress / Factor of Safety

c) Yield Stress = Permissible Stress / Factor of Safety
d) Permissible Stress = Yield Stress – Factor of Safety

Answer: b
Explanation: Permissible Stress = Yield Stress / Factor of Safety. Permissible Stress is the amount of stress that will not cause failure. It is a fraction of yield stress. It takes care of overload or other unknown factors.