Compute the positive and negative design moment capacity $(\backslash$Phi Mn$)$ for the rectangular beam provided below. Assume positive moment puts the $6$ No$.9$ bars in tension and the $4$ No$.9$ bars in compression. Assume negative moment puts the $4$ No$.9$ bars in tension and the $6$ No$.9$ bars in compression. The total height of the beam is $36,$ the concrete compressive strength is $4,000$ psi, and the steel rebar is Gr$.60.($Hint: To calculate negative moment capacity, simply flip the beam upside down and analyze the same way you did for positive moment

capacity$).$