the ABC company is using the step-down method to allocate it's support department (A,B &C) costs to production departments ( alpha & Delta ). The overhead cost of support department A allocated first, followed by B then C. The serice distributed as follow : Service supplied | . To B To C To Alpha To Delta By A 10% 50% 20% 20% By B 40% 15% 30% 15% By C 25% 25% - 20% 30% what is the percentage of C's cost that should be allocated to B