A city of size $42$km$\mathrm{²}$ is to be covered by a digital cellular phone network. The spectrum re$-$use cluster size is $3$ cells and each cell has an area $0\mathrm{.}2$km$\mathrm{²}.$ Assume that the cells perfectly fit the city size without overlap. If the system bandwidth is $35$MHz and FDM is used where each user is allocated $25$kHz including guard band, how many users can simultaneously use the system? How many can simultaneously use the system per cell?