A cellular system is composed of both macrocells and femtocells. There are a total of 200 voice channels available. Suppose a network engineer decided to implement frequency reuse by using a fixed partition of frequencies, some to the macrocells and the rest to femtocells. Macrocells use cluster sizes of 4 and 3 sectors per cell. Femtocells use cluster sizes of 1 and no sectoring; this assumes femtocells do not interfere with neighboring femtocells. a. If 20 channels are assigned to each femtocell, how many channels (both macrocell and femtocell channels) are potentially available to a mobile at every location