Objects A, B, & C make up a closed system. A has a charge of 53 C and is traveling east. B has a charge of 50 C and is traveling west. C has a charge of -62 C and is traveling north. All three collide with each other. After the collision A is traveling east with a charge of 18 C, B is traveling east with a charge of -73, and C is traveling south. Determine how much charge C now has.