Operations Research : Applications and Algorithms
Operations Research : Applications and Algorithms
4th Edition
ISBN: 9780534380588
Author: Wayne L. Winston
Publisher: Brooks Cole
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Chapter 5, Problem 1RP

a.

Explanation of Solution

Profit

  • Let XNP is the number of personal computers produced in New York, XLP is the number of personal computers produced in Los Angeles, XNV is the number VAXes in New York and XLV is the number of VAXes in Los Angeles and L is the labour hours.
  • The new optimum solution value or profit is calculated by the given formula:

    New value = Old value – (Key column value × Key row value) / Key value

  • The key row value can be calculated by the given formula:

   Key row value = Current key row value / Key element value

  • From the LINDO output, here the old optimum value is 1,360,000.
  • Hence the new value is:

 New value = 1,360,000 - 1000 (313.333) = 1,046,667

b.

Explanation of Solution

Increasing capacity

“Yes”, HAL should hire the contractor if the capacity is increased to 850 computers at a cost of 5000.

Reason

  • From the LINDO output, the dual price in row 2 is 133.333.
  • When the capacity is increased to 850 computers, then the profit should be increased by 850(133.333).
  • This means the profit value should be greater than 5000.
  • Hence the capacity should be increased and here the allowable increase is 100.
  • Hence HAL should hire the contractor in order to increase the capacity.

c.

Explanation of Solution

Profit

  • The new optimum solution value is calculated by the given formula:

    New value = Old value – (Key column value × Key row value) / Key value

  • The key row value can be calculated by the given formula:

   Key row value = Current key row value / Key element value

  • From the LINDO output, the reduced cost for XLV is 33.333.
  • Hence the profit of VAX can be increased by 33.333 in order to produce VAXes in Los Angeles.

d.

Explanation of Solution

Extra labour cost

  • Let L be the number of labour hours.
  • Here the labour is purchased at a cost of 20 per hour.
  • Here the Key value is 313.333.
  • Hence the extra labour cost = 313.333 + 20 = 333.33

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