ISI ME B 2012 Question 2 small doubt

[IISSII]

In the ISLM Model -:

C=200+0.25Yd
I=150+0.25Y-1000i
G=250
T=200
Md = 2Y-8000i
Ms = 1600

I have a small Doubt......i need to find Aggregate Expenditure (C bar + I bar+ G bar+ cT)

So, how do i handle the I bar? is it 150 only? If so then what about the 0.25Y? or is it 150+0.25Y? If so, then how do i find AE?