67 mm x 67 mm square rod is designed to hold 12 tonnes. It has a length of 250 cm.The rod is made from carbon steel. Its ultimate tensile strength

is 330 MPa, its yield strength is 150 MPa, and its modulus of elasticity is 410 GPa. It was designed to have a factor of safety of 6? Will the rod break? How much will the rod stretch? You may need to make an assumption. If so, list it.