A tensile test specimen has gage length 50 mm and its cross-sectional area 100 mm². The specimen yields at 48,000 N, and the corresponding gage length is 50.23 mm. This is the 0.2 percent yield point. The maximum load of 87,000 N is reached at a gage length of 64.2 mm. Determine (a) yield strength, (b) modulus of elasticity, and (c) tensile strength.