During a tensile test, a metal with starting gage length of 150 mm and a diameter of 12.7 mm is deformed into its plastic region. At one point during the tensile test, the gage length measured 166 mm at a true stress of 450 MPa. At another instant prior to necking, the gage length measured 177 mm with a corresponding true stress of 530 MPa. Determine the strength coefficient and the strain-hardening exponent for this metal.