A. Bitoy offers to buy Sergio's ranch under the following terms and conditions: P1 million purchase price, 10% option money, the balance payable in cash upon the clearance of the property of all illegal occupants. The option money is promptly paid and Sergio clears the ranch of illegal occupants in no time at all. However, when Bitoy tenders payment of the balance and ask Sergio for the deed for absolute sale, Sergio suddenly has a change of heart, claiming that the deal is disadvantageous to him as he has found out that the property can be sold three times the agreed purchase price. 1. May Bitoy compel Sergio to execute a deed of absolute sale for the subject ranch? 2. May Sergio justify his refusal to proceed with the sale by the fact that the deal is financially disadvantageous to him