Myriah Fitzgibbon, of L.A. Plumbing, uses 1,200 of a certain spare part that costs $25.00 for each order, with an annual holding cost of $24.00. a) Calculate the total cost for order sizes of 25, 40, 50, 60, and 100. (Round your responses to two decimal places.) Order Size Total Cost ($) 25 40 50 60 100 b) What is the economic order quantity? units (Round your response to two decimal places.)