E12.4. Calculating Core Profit Margin (Easy) A firm reports operating income before tax in its income statement of $73.4 million on sales of $667.3 million. After net interest expense of $20.5 million and taxes of $18.3 mil- lion, its net income is $34.6 million. The following items are included as part of operating income: Start-up costs for new venture Merger-related charge Gains on the disposal of plant $ 4.3 milion $13.4 milion $3.9 million The firm also reports a currency translation gain of $8.9 million as part of other compre- hensive income. Calculate the firm's core operating income (after tax) and core percentage profit margin. The firm's marginal tax rate is 39 percent.