In a certain mid-size city, 90% of the high school graduates are from public schools
and the other 10% are from private schools. Of the private school grads, 80% go on
to complete college, but only 50% of the public school grads complete college. What
is the probability that a high school graduate from this city will complete college?

A) 1.3
B) .9
C) .58
D) .47
E) .53