Some laptops, TVs, and other devices come with a 'power brick' that is essentially just a transformer. Looking at the labeling on a random laptop power brick, it's designed to plug into a 120 V (rms) wall socket and produces 9 V (rms) on the side that connects to the device. If the device is drawing Pavg = 100 W while charging, (a) how much (rms) current is going from the wall into the power brick, (b) how much (rms) current is being delivered to the laptop, (c) what is the NP/NS ratio for this transformer?