Sales revenue for the year was $1,680,000, gross profit was $320,000, and net income was $93,500. One year ago, accounts receivable was $76,000, inventory was $110,000, total assets were $460,000, and shareholders' equity was $170,000. If the company's interest expense was $12,000 and its income tax expense $10,000, what was the company's interest coverage ratio for the year?