A small businessman tries to buy a computer to help with the job. He needs a small computer, but the expected growth of the business might lead to the incompatibility of the small system in the next few years. The alternatives for the businessman were limited to buying a small device or a small device that can be increased in size or a large device, and their purchase prices were 4000, 6000, and 9000, respectively. In a period of 3 years, he can replace the small or medium system with a large system at a cost of 7500 pounds or expand in the expandable device at a cost of 4000 pounds. The probability of his needs for a large computer system within 3 years has been estimated to be 80%. The probability of his needs for a small computer system within 3 years has been estimated to be 20%. o Analyze the problem using a decision tree. o State which decision is the best decision for the businessman