In a tensile test on mild test on mild steel, the gauge length was \(50 \mathrm{~mm}\) and diameter \(10 \mathrm{~mm}\). The load at the proportional limit was \(30 \mathrm{kN}\) and at the upper yield point 32 \(k N\). The extension on \(50 \mathrm{~mm}\) gauge length was \(0.028 \mathrm{~mm}\) under a load of \(8.8 \mathrm{kN}\). Calculate the (a)Proportional limit,

(b) upper yield point stress, and (c)modulus of elasticity.