I am not huge fan of these kinds of one liner questions. You will see very soon how far they are from real exam questions. Well for these kinds of questions (essentially I consider them crappy as they try to see if you can use formula, a high school kid will do if s/he knows the formula) where no other information is provided, you assume there is typical variance i.e. EAC will reflect current variation throughout the life of project.

i.e. calculate EAC like this:  EAC= BAC/CPI

(I know you are confused in this area of PMP exam :).  When you see no other info given to decide; use this formula mentioned above as a default one. Usually in real exam and good perp. exams, you have information in question to decide how to calculate correct EAC on the basis of this)

So calculate EAC as mentioned above and calculate VAC=BAC-EAC   {+ ive VAC mean project is under budget}

HTH

Shuk