A machine component is subjected to stress of 80 MPa for 60% of time and 180 MPa for rest of time. The fatigue life are 106 cycles and 4 × 104 cycles for 80 and 180 MPa respectively. The fatigue life of component is
1
4.7 × 105
2
9.4 × 105
3
4.7 × 104
4
9.4 × 104