A foreman for a firm admits that on 10% of his shifts he forgets to shut off the machine ...

A foreman for a firm admits that on 10% of his shifts he forgets to shut off the machine. This causes the machine to overheat and the probability that a defective mold will be produced during the early morning run increases from 2% to 20%.
Draw a probability tree that represents this information and use it to calculate the probability that a defective mold is created.