The diagram shows the dimensions of an office. it costs about $0.11 per year to air condition one cubic foot of space on for average, how much does it cost to air condition the office one month?

I will assume here that the dimensions of the office are 12x32x25 feet - I think that this is what your question is mentioning.

This means that the whole volume of the room is:

12x32x25=384*25=9600

So, if you want to measure how much they will pay in the whole year, it will be:
9600*0.11=1056 dollars.

But this is per year! how much would it be per month? we divide by 12:
1056/12=88

So they would pay 88 dollars a month