In a Local Mobile Phone Area,company a Accounts for 60

Multiple Choice

In a local mobile phone area,company A accounts for 60% of the mobile phone market,while company B accounts for the remaining 40% of the market.Of the mobile calls made with company A,1% of the calls will have some sort of interference,while 2% of the mobile calls with company B will have interference.
- If a mobile call is selected at random and has interference,what is the probability that it was with company A?

A) 0.571
B) 0.429
C) 0.071
D) It cannot be determined.