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10. Consider the following optimal tableau, where S, and S2 are slack variables added to the original problem: XI X2 S1 S Basic CB 10 30 0 0 Quantity X1 10 4 2 O 160 S2 0 O 6 -7 200 Zi 10 40 20 1600 o o Cj - Zi 0 -10 -20 a What is the range of optimality for the contribution rate of the variable X1? b) How much would you be willing to pay for one more unit of the first resource, which is represented by slack variable S? c) What is the value of one more unit of the second resource? Why? d) What would the optimal solution be if the profit on Xi were changed to RM12 instead of RM10? How much would the maximum profit change? el How much could the right-hand side in constraint number 2 be decreased before profit would be affected