Three odd-shaped blocks of chocolate have the following masses and center-of-mass coordinates: (I) 0.300 kg, (0.200 m, 0.300m); (2) 0.400 kg, (0.100m, -0.400m); (3) 0.200 kg, (-0.300 m, 0.600 m). Find the coordinates of the center of mass of the system of three chocolate blocks.