Models M and M are available smartphones to consumers. Each one can be of either good or low quality. There is only one test T that can be used. Ti on M costs R100. On M2, T1 costs R50. The cost of repairing an M if it is of poor quality is R700. If M is of poor quality, the repair costs R740. Test T on M will confirm good quality with a probability of 0.8 and bad quality with a probability of 0.65. Test T on M will confirm good quality with a probability of 0.75 and bad quality with a probability of 0.7. A consumer wants to buy one of the two smartphone models and wants both examined to determine which model is more economic. i. ii. Construct a decision tree for this problem. Which model is more economic? [14] [2]