End to end throughput and bottleneck links

Assuming that the senders are sending at the maximum rate possible, what are the link utilizations for the sender links (RS), client links (RC), and the middle link (R)?

A)Sender links (RS) =.___ %.

B) Client links (RC) = ___ %.

C) Middle link (R) = ___%.

Consider the scenario shown below, with four different servers connected to four different clients over four three-hop paths. The four pairs share a common middle hop with a transmission capacity of R=100Mbps. The four links from the servers to the shared link have a transmission capacity of RS=30Mbps. Each of the four links from the shared middle link to a client has a transmission capacity of RC=80Mbps per second