The forces F1, F2, ... , Fn acting at the same point P are said to be in equilibrium if the resultant force is zero, that is, if F1 + F2 + .". + Fn = 0. YA 20 16 30 60 20 12 10 (a) Find the resultant force acting at P. (Round your answers to two decimal places.) (b) Find the additional force required (if any) for the forces to be in equilibrium. (If an answer does not exist, enter DNE. Round your answers to two decimal places.)