Answer:
The maximum debt ratio (measured as debt/assets) the firm can use is 51.5%.
Explanation:
Times Interest earned ratio = Earning Before Interest and Tax / Interest Expense
4 = ( Sales - operating costs ) / Interest Expense
4 = ( $450,000 - $355,000 ) / Interest Expense
4 = $95,000 / Interest Expense
Interest Expense = $95,000 / 4
Interest Expense = $23,750
Interest Expense = Total Debt x Interest on Debt
$23,750 = Total Debt x 7.50%
Total Debt = $23,750 / 7.50%
Total Debt = $316,667
Debt ratio = Total Debt / Total Assets
Debt ratio = 316,667 / 615,000
Debt ratio = 51.5%