Vulcan Company's contribution format income statement for June is as follows: Vulcan Company Income Statement For the Month Ended June 30 Sales Variable expenses Contribution margin Fixed expenses Net operating income $900,000 400,000 500,000 470,000 $ 30,000 Management is disappointed with the company's performance and is wondering what can be done to improve profits. By examining sales and cost records, you have determined the following: a. The company is divided into two sales territories-Northern and Southern. The Northern Territory recorded $400,000 in sales and $180,000 in variable expenses during June; the remaining sales and variable expenses were recorded in the Southern Territory. Fixed expenses of $216,000 and $135,000 are traceable to the Northern and Southern Territories, respectively. The rest of the fixed expenses are common to the two territories