A video in khan academy beautifully derived a formula for this. It was finally nRt*ln(final volume/initial volume)... That's what I remember. So my final answer will be in terms of nrt. Is that okay?

A bigger problem is, do I take this p(t) in degrees or radian? I mean when I calculate p at a certain t, should I put my calc in degrees or radians? For this case I am assuming radians. Because for degrees there is barely any change in pressure.

But what do I do for all other such cases in physics?

Radians are the "natural" measure of an angle, so in general angles in physics problem are in radians unless told otherwise.

Thanks