What is the debt payments-to-disposable income ratio?

Liquid assets = $10,000

Home value = $210,000

Investment assets = $90,000

Personal property = $20,000

Short-term debt = $5,500

Mortgage debt (30 yr.) = $170,000

Short-term debt payments = $250/month

Mortgage debt payments = $1,300/month

Gross income = $9,000/month

Disposable income = $6,800/month

Expenses = $6,000/month

PLEASE SHOW WORK

What is the debt payments-to-disposable income ratio? Is it (1300+250) / 6800 ?