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

Physical layer transmission rate: $54Mbps$

MAC layer header: $28$ bytes

MAC layer payload: $1452$ bytes

ACK and CTS frames: $14$ bytes

RTS frames: $20$ bytes

SIFS: $16s$

DIFS: $34s$

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 assume 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?