Calculate the interest burden measured by total assets Income Statement Data Sales 1200 Operating Income 150 Depreciation 35 Interest Expense 25 Pretax Income 90 Income Taxes 35 Net Income after tax 55 Balance Sheet Data Fixed Assets 200 Total Assets 500 Working Capital 175 Total Debt 125 Equity 250 Select one: a. 7% O b. 6.5% O c. 5% O d. 10.5% O e. 3%