Yibo Ltd owns a motor car that it wants to sell. The car needs a replacement engine costing 1,200 before it can be sold. The company's engineer, who is paid 25 per hour, would take 15 hours to fit the replacement engine. The company is currently short of work but wishes to retain the services of the engineer as an upturn in work is expected in the future. The company paid 7,800 to acquire the car and it could be sold, with or without the new engine. for 4,600. What is the minimum price for which Yibo Ltd should sell the car if the new engine is fitted?