Consider a thin metal plate 20 mm wide which contains a centrally positioned, through-thickness crack. The plate is exposed to reversed tensile-compressive cycles of stress amplitude 125 MPa. If the initial and critical crack lengths are 0.20 and 8.0 mm, respectively, and the values of m and A are 4 and 5*10^-12, respectively (for change in stress in MPa and a in m), estimate the fatigue life of this plate.