A corporation has $900,000 of debt outstanding, and it pays an
interest rate of 6 percent annually on its bank loan. The firm's
annual sales are $4,200,000; its average tax rate is 30 percent;
and its net profit margin on sales is 5 percent. If the company
does not maintain a times interest earned (TIE) ratio of at least 4
times, its bank will refuse to renew its loan, and bankruptcy will
result. What is this firm's current TIE ratio?