So you have 3 phone companies: Company A has a 41% share on the market, B has 38% and C has 21%, summing up gives 100%, so they are really the only ones.

Now they say that 35% of A and B and 30% of C company customers are unsatisfied with the service.

What is probability of a satisfied customer be connected to company B?

Can anyone help me solve this, thank you!