Bovine Corporation has two divisions: televisions and mobile phones. The mobile phone division has a contribution margin of $600,000. The company's common fixed costs and total traceable fixed costs are $100,000 and $500,000 respectively.
What is the segment margin of the mobile phone division, assuming the traceable fixed costs of the television division are $300,000?

a) $100,000 b) $200,000 c) $300,000 d) $400,000