getting lost in my math

2. A solid bar with a square cross section (a = 2 in.) is machined down in the center to a height of d = 1.5 in. A force P = 10 kips is applied as shown. Determine the maximum tensile stress and the maximum compressive stress in the machined section of the bar. (Hint: the Z is the vertical distance between the centroid of the milled section (a by d) and the line of action of the P forces.) Ans: Gmax,T = 6.667 ksi, Gmax,C = 0 ksi