Kamau writes to Gitau offering to sell him his car at ksh. 500,000. Gitau accepts the offer subject to the price being reduced to Ksh.450, 000. Kamau is not willing to sell the car for Shs.450,000. Gitau writes back and agrees to buy the car for Shs.500, 000. Kamau has refused to sell the car and Gitau is aggrieved. Advise Gitau on the legal position of the situation.