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Suppose that 50% of people who go to work in Seoul take the subway, 30% take...

Suppose that 50% of people who go to work in Seoul take the subway, 30% take the bus, and 20% take the car. subway
3% chance of a person coming to work using computer will be late, 5% probability that a person using a bus will be late.
Let's say the probability is 10%.

(a) What is the probability that someone in Seoul will be late for work?

(b) When a person is late, what is the probability that the person used the subway?

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