Consider the following Transportation problem whose initial solution is given below: Demand N 12 9 18 Supply 1 3 4 5 16 20 13 9 1 13 22 35 12 8 7 15 2 15 20 35 1 26 24 16 18 11 3 18 1 1 20 18 16 14 20 22 Check whether this tableau is optimal or not by finding the u; and vi values. Let 0 jj = U; + v; - Cij, be the coefficient of variable Xij, and ij AC = Crow Enext the amount of cost reduction. If O jj > 0, then enter ij the "+" sign before the number, e.g., +8. Similarly, do so when 0 ;