For a television network , 5×105 channels are granted. If the central frequency of the microwave link is 25 GHZ and the allotted band width for each channel is 2 KHZ, how much percentage of link is used for the network?

Allotted bandwidth for each channel = 2 KHz = 2000 Hz  No of Channels  = 5×105  Bandwidth for all channels = 2000 × 5×105 = 109 Hz    Frequency of microwave link = 25 GHz = =25×109Hz Percentage of link used  = 10925×109=125=0.04 i.e 4%