In a local cellular phone area, company A accounts for 70% of the cellular phone market while company B accounts for the remaining 30% of teh market....

In a local cellular phone area, company A accounts for 70% of the cellular phone market while company B accounts for the remaining 30% of teh market. of teh cellular calls made with company A, 2% of the calls wil have some sort of interference, while 3% of the cellular calls with company B will have interference. Given that a randomly selected cellular call is that has interference, what is the probability it came from company A.