A Non-Uniform Meter Stick Is Found to Balance on a Knife

A non-uniform meter stick is found to balance on a knife edge at the 60-cm mark. Where is the center of gravity of the meter stick?

A) at the 40-cm mark
B) at the 45-cm mark
C) at the 50-cm mark
D) at the 55-cm mark
E) at a position not given