To calculate Thabang's account balance after the transactions, we start with the opening balance and apply the changes step by step.
- Starting balance: R2000.00 (credit)
- Less textbooks purchase: R2000.00 - R1570.00 = R430.00
- Less interest due to late payment: R430.00 - R50.75 = R379.25
- Add funds from funder: R379.25 + R1580.00 = R1959.25
Therefore, Thabang's account balance after these transactions is R1959.25.