$3-68.$ A short post is made by filling a standard $66\frac{1}{2}$ steel tube with concrete, as shown in Figure P$3-67.$ The steel has an allowable stress of $21600$Psi The concrete has a rated strength of $6000$psi but, in this application, the stress is to be limited to $1500$psi. See Section $2-10$ for the modulus of elasticity for the concrete. Compute the allowable load on the post.

$6000$ psi, but, in this application, the stress is to be limited to $1500$ psi. See Section $2-10$ for the modulus of elasticity for the concrete. Compute the allowable load on the post.