Answer:
The debt-to-income is a finance measure to compare the amount of debt a person has to his overall incomes. This ratio is used by lenders and issuers of mortgages to calculate the ability of a client to pay each month.
To calculate this ratio you just have to divide all your monthly obligations like loans, mortgage, child support, credit cards, and others, by your monthly income. This would give the ratio which tells if your ability to pay.
Therefore, the answers would be mortgage, debts, credit cards, and all monthly obligations you have to pay for.