Your model in (b) was solved using Solver and the sensitivity report is given in Table 1 below.

Variable Cells
			Final	Reduced	Objective	Allowable	Allowable
	Cell	Name	Value	Cost	Coefficient	Increase	Decrease
	$B$2	No. of days to operate One	4	0	6000	1000	6000
	$C$2	No. of days to operate Two	0	1000	7000	1E+30	1000
Constraints
			Final	Shadow	Constraint	Allowable	Allowable
	Cell	Name	Value	Price	R.H. Side	Increase	Decrease
	$D$7	High-grade LHS	24	0	12	12	1E+30
	$D$8	Medium-grade LHS	8	3000	8	1E+30	4
	$D$9	Low-grade LHS	16	0	5	11	1E+30

(c) What is the optimum number of days to operate each mill? ( 3 marks )

(d) What is the total cost to United for this solution? ( 2 marks )

(e) Why is the Reduced cost for mill One zero? ( 2 marks )

(f) Why are the shadow prices for High-grade and Low-grade zeros? ( 3 marks )

(g) What is the effect on the optimal solution if the operating cost for mill One

increases to GH6,500? ( 3 marks )