Jabir decides to sell his car and places an advertisement in a local newspaper on Monday stating: 'Ford 2018 model car for sale - RF 80000/- for a quick sale.' He also gave his contact details. Ali viewed the car on Tuesday and said he would pay RF 78000/- and said Jabir must let him know by Friday if that was not agreeable. On Wednesday Suma viewed the car and later that day she posted a letter stating that she agrees to buy the car for RF 80000/-. On Thursday Jabir received Suma's letter and sent a letter in reply saying he would sell it to Suma for RF 80000/-. On Friday Aisha viewed the car on Jabir's driveway and posted a note through his letterbox saying 'the car is ideal for what I want and I enclose a cheque for RF 80000/. I will collect it tomorrow. On Saturday Ali phoned Jabir to arrange his collection of the car and payment of RF 78000/. The same day Suma phoned Jabir to say she could not pay RF 80000/- for the car.

Jabir seeks your advice on whether he has formed a valid contract to sell his car with any of the parties?

I need the answers in IRAC format, first issues identification, then the rules applicable to this case from contract law in detail. like the offer, counteroffer, acceptance, whether this is an invitation to treat in Ali, and Suma's contract, the postal rule is if at all effective in Aisha's post. However, in Aisha's case, is this an invitation to treat as she saw Jabir's car in his driveaway, and is Aisha's cheque with the note posted to Jabir's mailbox is considered as a registered post? I also need to know the consequences if Jabir's price of the car falls below the market price. to conclude what is the advice given to Jabir regarding the contractual terms in each case with Jabir.