I'm currently stuck trying to answer this question. The question asks for me to find the resistance of R2 for R1 to be at 4V when the PNP transistor has a beta of 250. My current train of thought was to substitute 4V as the voltage of R1 and solve for current which gave me 80mA, then use Ic = β/Ib to calculate Ib which was 0.32mA. I also worked the emitter current, Ie to be approximately 79mA.
This is where I got stuck, I now know the current of R2 but I don't know the voltage or the resistance so I can't work out either of these values. Is there something I'm not considering here? Am I going about this the wrong way? I'm really confused. Any help would be appreciated!