Can someone help me answer this? I am confused....

WXXX, WYYY, AND WZZZ are three radio stations that compete for listeners. Each month some of the listeners switch from one station to another while some remain loyal to their current station. It has been found that each month: 20% of the listeners of WXXX switch to WYYY 10% of the listeners of WXXX switch to WZZZ 30% of the listeners of WYYY switch to WXXX 10% of the listeners of WYYY switch to WzzZ 20% of the listeners of WZZZ switch to WXXX 30% of the listeners of WZZZ switch to WYYY Currently, the listening audience is divided as follows: 35% listen to WXXX 40% listen to WYYY 25% listen to WzZz (a) What fraction of the listeners will WZZZ have after 2 months? (b) What fraction of the listeners will WXXX have after 3 months? (c) What fraction of the listeners will WYYY have after 5 months