An application on host A $($App$-$A$)$ is communicating with an application on host B $($App$-$B$)$ over a TCP connection. It is known that $2000\_$ B on host A and $2500\_$B on host B areallocated for receive buffers espectively at the beginning of the communication. After some rounds of transmission, up to time$-$t$0,$ App$-$A has sent $8700$ B of data $($message$)$ in total in which $250$ B of data has been repeated $($re$-$transmitted$).$ If App$-$B has processed $7350$ B of data until time$-$t$0$ then how many bytes are free in the receive buffer on host$-$B at time$-$to$?$

What are the solution steps of the problem?