2010 AMC 8 Problem 15

A jar contains five different colors of gumdrops: 30\% are blue, 20\% are brown, 15\% red, 10\% yellow, and the other 30 gumdrops are green. If half of the blue gumdrops are replaced with brown gumdrops, how many gumdrops will be brown?

\textbf{(A)}\ 35 \qquad\textbf{(B)}\ 36\qquad\textbf{(C)}\ 42\qquad\textbf{(D)}\ 48\qquad\textbf{(E)}\ 64

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.