Ace Computer store probability

Ace Computer store receive laptops from 3 different computer vendors. Ace receive 20% of laptop, from B 40% and 40 % from vendor C. The probability of receiving a defective laptop from A is .01, B, .02 and C, .08.
a. Develop a probability tree showing all marginal, conditional and joint probabilities.
b. Develop a joint table
c. What is the probability that a defective laptop returned came from vendor B.

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