Answer:
21% to 30%
Step-by-step explanation:
The debt to income ratio indicates the percentage of the earnings that are being used to pay the debts every month. The guidelines for Marines state that when the ratio is less than 15% they have to be careful when taking a loan and when it is from 16% to 20% they should avoid taking more debt. Also, from 21% to 30%, they are overextended and shouldn't take more debt and more than 30% indicates that they have to get help to decrease the debt.
According to this, a Marine might be considered overextended when the debt to income ratio is between 21% to 30%.