Answer:-
Volume does not change.
Explanation:-
Initial Pressure P 1 = P
Initial Temperature T 1 = T
Initial Volume V 1 = V
New Pressure P 2 = 15.5 P
New Temperature T 2 = 15.5 T
Using the relation
P 1 V 1 / T 1 = P2 V2 / T2
V 2 = P 1 V 1 T 2 / (T 1 P 2)
= P x V x 15.5 T / ( T x 15.5 P)
= V
We see the new volume is same as initial volume.
So the volume does not change.