A CU triaxial test was conducted on a normally consolidated sample of a saturated clay. Its undrained shear strength at a mean effective stress of 100 kPa was 22 kPa. Estimate the undrained shear strength of a sample of this clay if Ro = 15 and the initial stresses are the same as the sample that was tested. The consolidation parameters are λ = 0.28 and k = 0.06.