Given:
Annual income: 46,000
Annual debt payment: 1,200/mo * 12 months = 14,400
debt payment to gross income ratio = debt payment / gross income
before the car:
debt payment to gross income ratio = 14,400 / 46,000 = 0.313 or 31.3%
40% debt payment to gross income ration → 46,000 x 40% = 18,400
w/ car loan: 1,200 + 435 = 1,635
Annual debt payment = 1,635 x 12 months = 19,620
debt payment to gross income ratio = 19,620 / 46,000 = 0.4265 or 42.65%
If Robin buys the car, she will have a debt payment to gross income ratio of 42.65%.
Robin can only afford to pay an additional amount of 333.33 for car loan payment to still pass the 40% debt payment to gross income ratio requirement.
18,400 - 14,400 = 4,000
4,000 / 12 mos = 333.33 per month