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Answer:
With the limited information I have, the simple answer would be to use a mesh topology, replace the hubs with fast ethernet switches(10/100Mbps or GiG e) and a router (technically, with only 15 users, you could replace all current equipment with one layer 3 switches). You could create subnets for each department of the company, thus creating different collision domains which would eliminate dropped packets. The throughput would be increased based upon the upgraded switch/router, but then you would have to upgrade the computer's NIC as well. If they were using 10 Mbps hubs, then most likely they only had NICs to support 10 Mbps. Also Setup a file server to store the large files.
Explanation
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