The bar’s cross-sectional area is given as a function of the axial coordinate in inches by A = (1 +.

The bar’s cross-sectional area is given as a function of the
axial coordinate  in inches by A = (1 + 0.1)
in2. The modulus of elasticity of the material is E = 12E6
psi. If the bar is subjected to tensile axial loads P = 20 kip at its
ends, what is its change in length?