Find the current (io) in the R = 13k? resistor in the circuit by making a succession of appropriate source transformations
Work back through the circuit to find the magnitude of the power developed (P50V) by the 50 V source.
Usually everyone explains the process pretty well, but if able I’d like as much detail as you are willing to provide. Source transformations are the only issue I’m having with this current chapter. This ones seems complex to me.