A steel bar 5 m x 50 mm is loaded with 250, 000 N. If the modulus of elasticity of the material is 0.2 MN/mm2 and Poisson's ratio is 0.25, the change in the volume of the bar is :

• 1.125 cm3
• 2.125 cm3
• 3.125 cm3
• 4.125 cm2