You are consulted by Xoli Ntamo, who instructs you that she advertised the sale of her 2015 model Toyota Etios motor vehicle on her Facebook page, indicating the details of the vehicle and the asking price of R150 000. The next day she received an email from one Zipo Heunis, who offered to buy the vehicle for only R140000. The same day Xoli wrote back to Zipo and accepted his offer of R140 000, but only on condition that Zipo would obtain a roadworthy certificate for the vehicle from the Traffic Department at his expense, in order to make it possible for the vehicle to be transferred into his name. Xoli heard nothing further from Zipo, and over the next two weeks tried in vain to contact him by email and phone. Xoli now wishes to claim from Zipo the purchase price of R140000, and to arrange for transfer of ownership of the vehicle to Zipo.

Explain/What are the legal principles applicable to this case, how would I advise Xoli on her prospects of success with her claim for the purchase price if she was to go to court?.