Refer to the table that follows.
a) Use the northwest- corner method to find an initial feasible solution. What must you do before beginning the solution steps?
b) Use the intuitive lowest- cost approach to find an initial feasible solution. Is this approach better than the northwest- corner method?
c) Find the optimal solution using the stepping- stonemethod.

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70 A|B| $10 S18 $12 $17 S13 S9 $20 S18 Si4 FROM C SUPPLY 100 50 75 DEMAND 5080 70 50 | 80 | 70