You have an account $(30$ day term$)$ at TEDGARS Fashion, you've always used shopping as a form of retail therapy and now you owe R$5600$ made up as follows:

R $1800$ on invoice IN$890$ dated $4$ Jan $2023$

$,$ R $1100$ on invoice IN$1059$ dated $11$ Jan $2025$

$,$ R $300$ on invoice IN$1189$

dated $17$ Jan $2023$

$,$ R $2400$ on invoice IN$1489$

dated $9$ Feb $2023$

What is the amount due at $28$ February $2023?$