Before a Marketing Research Study Was Done, John Colorado Believed

Short Answer

Before a marketing research study was done, John Colorado believed there was a 50/50 chance that his music store would be a success.The research team determined that there is a 0.9 probability that the marketing research will be favorable given a successful music store.There is also a 0.8 probability that the marketing research will be unfavorable given an unsuccessful music store.
(a)If the marketing research is favorable, what is the revised probability of a successful music store?
(b)If the marketing research is unfavorable, what is the revised probability of a successful music store?