15MR2/32
9MR2/32
13MR2/32
11MR2/32
ITotal disc = MR2/2
As mass is proportional to area,
MRemoved = M/4
Now, about the same perpendicular axis:
IRemoved = (M/4)(R/2)2/2 + (M/4)(R2)2 = 3MR2/32
⇒IRemaining Disc = ITotal - IRemoved = MR2/2 - 3MR2/32 = 13MR2/32