Dean Kuroff started a business of rehabbing old homes. Hhe recently purchased a circa-1800 Victorian mansion and converted it into a three-family residence. Recently, one of tenants complained that the refrigerator was not working properly. Dean's cash flow was not extensive, so he was not excited about purchasing a new refrigerator. He is considering two other options: purchase a used refrigerator or repair the current unit. He can purchase a new refrigerator for $400, and it will easily last 3 years. If he repairs the current one, he estimates a repair cost of $150, but he also believes that there is only a 30% chance that it will last a full 3 years and he will end up purchasing a new one anyway. If he buys a used refrigerator for $200, he estimates that there is a 0.6 probability that it will last three years. If it breaks down, he will still have the option of repairing it for $150 or buying a new one. Develop a decision tree for this situation and determine Dean's optimal strategy.