I'm more than a bit perplexed with this curve ball they threw at me. No RsubB or RsubC! My thought was the IsubB would be the Vbb - Vbe/RsubE which is 1.3mA. But peeking at the answer key that is what they have for IsubE! The value for IsubB in the answer key is 30uA and my model schematic in LTS using the generic NPN model gives 12uA. I'm missing something here and I don't think it is using the αsubDC, which I could use to double-check my IsubC/IsubE relationship. No model number was given for the xstr so the PDF is not available for reference. Prior problems have Assumed VsubCE(sat) is 0.2V if that is of any help?