Consider the following tableau corresponding to a basic solution of a maximization LB with original non-negative variable X1, X2, X3 and slack/surplus variable X4, Xs, X6: Z X X2 X3 X X X6 RHS Z 1 0 -5.5 3 0 0 7.5 48 X4 0 0 nz -1 1 0 1 10 X 0 0 -1 1 0 1 -1 5 0 1 3 -1 0 0 1 6 X By analyzing the current objective function value and the values of the original variables in the current basic solution, we determine that the original cost coefficient of xy(i.e., C) for this LP is equal to