10. For the cast iron beam shown, the maximum permissible compressive stress is 12,000 psi and the maximum permissible tensile stress is 5000 psi.  Find the maximum safe load P that can be applied to the beam as shown.
 

a. 220 lb
b. 333 lb
c. 1250 lb
d. 3000 lb
e. 7500 lb