I tried solving this problem which looks simple, but I'm not getting any of the answers below:

Jill's weekly mortgage payment is $400 (principal and interest).Monthly heating and condo costs are $80 and $220, respectively.Property taxes are $3,200 per annum.Consumer debt payments are $500 a month.If Jill earns $80,000 gross a year, what is her GDS ratio?

a)12.85%

b)32.85%

c)36.91%

d)40.35%

The formula for GDS that we are taught is: GDS=(Principal+Interest+Tax+Heat)/ Gross Annual Income

First I'm converting everything to months

3200/12=266.67$

80000/12=6666.67$

Then I'm doing:

I'm doing (400$+266.67$+80$)/6666.67$=11.20% which is not one of the options.

I need help figuring out what I'm doing wrong.

Thanks