Answer:
Lazarus Corporation
A properly constructed segmented income statement in a contribution format would show that the net operating income of the company as a whole is: 
= $47,000.
Explanation:
a) Data and Calculations:
                                        North        South            Total
Sales revenues          $380,000   $230,000   $610,000
Variable expenses       213,000       104,000      317,000
Contribution               $167,000    $126,000   $293,000
Fixed expenses:
   Traceable                   65,000       25,000        90,000
   Common                    84,000        72,000      156,000
   Total                       $149,000      $97,000   $246,000
Operating income      $18,000      $29,000     $47,000
b) Segmented income statement is prepared to show the contributions and operating income generated from different segments of the entity.  It helps to evaluate performances of segments and to identify profitable or less profitable segments.