Calculate the efficiency of stop-and-wait ARQ, Computer Networking

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Suppose that frames are 1250 bytes long including 25 bytes of overhead. Also assume that ACK frames are 25 bytes long. Calculate the efficiency of stop-and-wait ARQ
(a) Transmits at R = 1Mbps and a reaction time of 1ms.
(b) Transmit at R = 1Mbps and a reaction time of 10ms
(c) Transmit at R = 1Gbps and a reaction time of 100ms.
(d) Transmits at R = 1Gbps and a reaction time of 1 second.

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