I found the missing data:
Monthly expenses:
rent is $695
car payment is $265
student loan's $200
credit cards $160
695 + 265 + 200 + 160 = 1,320
1,320 * 12 months = 15,840
Debt-to-Income ratio = 15,840 / 36,000
Debt-to-Income ratio = 0.44
Trudy's DTI ratio is d. 44%