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MadeEasy Test Series 2017: Computer Networks - Communication

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Assume there are 100 nodes are connected to a 1000 meter length of the coaxial cable. Using some protocol, each node can transmit 50 frames/second, where the average frame length is 2500 bits. The transmission rate at each node is 108 bps. The efficiency of this protocol is ________. (Upto 1 decimal place)

I got .125 but given is 12.5%?Please check which is correct?

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