A Wi$-$Fi network has the following features:

Physical layer transmission rate: $300Mbps$

MAC layer header: $28$ bytes

MAC layer payload: $1472$ bytes

ACK and CTS frames: $15$ bytes

RTS frames: $20$ bytes

SIFS: $12s$

DIFS: $25s$

Define MAC layer throughput as the number of bits sent by the MAC layer in a given

period of time. Ignore the propagation time and the station will immediately send the

data if the channel is idle after waiting DIFS. Assuming that there are two stations

$($one is the access point$)$ continuously exchanging data using $802\mathrm{.}11$ CSMA$/$CA$,$ what

is the MAC layer throughput?