To solve this problem you must apply the proccedure shown below:
 1- You must use the formula for calculate the debt ratio, which is:
 

 Where 
 is the total liabilities and
 is the total liabilities and 
 is the total assets
 is the total assets
 2- Then, when you substitute the values into the formula, you obtain the following resultt:
 

 
 %
 %
 Therefore, as you can see, the answer is: 
 %
%