A wireless LAN with one AP has 10 client stations. Four stations have data rates of 6

Question:

A wireless LAN with one AP has 10 client stations. Four stations have data rates of 6 Mbps, four stations have data rates of 18 Mbps, and the last two stations have data rates of 54 Mbps. What is the data rate experienced by each station when all ten stations are sending data together, and
(a) TXOP is not used?
(b) TXOP is used?

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