A beаm hаs dimensiоns оf b = 18 in., h = 12 in., аnd d = 9.5 in. and is reinfоrced with 4 No. 11 bars. The concrete strength is 4,700 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the neutral axis is c = 6.388 in., does the reinforcement yield?