Division X of firm XYZ is an investment center whose performance is evaluated using operating income. In the last quarter, division X reported a pre-tax income of $150,000. This included investment income of $20,000. Division X also has long- term debt on which it paid interest expenses of $30,000 in the last quarter. What is the operating income of division X? $160,000 $180,000 $130,000 $150,000