Problem Solving

For any triangle T in the xy-coordinate plane, the center T is defined to be the point whose x-coordinate is the average (arithmetic mean) of the x-coordinates of the vertices of T and whose y-coordinate is the average of the y-coordinates of the vertices of T. If a certain triangle has vertices at points (0,0) and (6,0) and the center at the point (3,2) what are the coordinates of the remaining vertex?

A. (3,4)
B. (3,6)
C. (4,9)
D. (6,4)
E. (9,6)


Please Explain..

thanks...