Use a probability tree diagram and calculate the probabilities that the Fabufirst assembled units are (i) defective in stage 1 and defective in stage 2 (are completely defective); (ii) defective in stage 1 and are not defective in stage 2 (called Repairable I); (iii) not defective in stage 1 but are defective in stage 2 (called Repairable II); and (iv) not defective in stage 1 and are not defective in stage 2 (completely good). 

What is the probability of producing repairable assembled units?