KWARTENG v. SEI AND ANOTHER Sale of goods—Vehicle—Sale under "work and pay" system—When property passes—Determinable on the intention of parties—Payment of purchase price by instalments—Right of seller to take possession on failure of payment of an instalment—Buyer not entitled to sell or transfer vehicle until all instalments have been paid—Whether buyer owner of vehicle before payment of balance—Whether agreement for hire-purchase or credit sale—Sale of Goods Act, 1962 (Act 137), s. 26 (1).