Consider the figure below, which shows the application-to-application throughput achieved when two senders are competing at a shared bottleneck link. Suppose that when the overall arrival rate, lambdam' (for each sender) is close to R/2, the throughput to the application layer (at each receiver), lambdaout, is equal to 0.8* lambda,n'. R/2 throughput: 2out 2in R/2 "wasted" capacity due to retransmissions when sending at R/2, some packets are needed retransmissions What fraction of the packets transmitted at the sender are retransmissions?