Within a Large Metropolitan Area, 10% of the Commuters Currently

Multiple Choice

Within a large metropolitan area, 10% of the commuters currently use the public transportation system, whereas the remaining 90% commute via automobile. The city has recently revitalized and expanded its public transportation system. It is expected that 6 months from now 10% of those who are now commuting to work via automobile will switch to public transportation, and 90% will continue to commute via automobile. At the same time, it is expected that 40% of those now using public transportation will commute via automobile, and 60% will continue to use public transportation. In the long run, what percent of the commuters will be using public transportation? ​

A) 30%
B) 40%
C) 35%
D) 20%
E) 25%