Abey​ Kuruvilla, of Parkside​ Plumbing, uses 1,220 of a certain spare part that costs ​$27 for each​ order, with an annual holding cost of ​$25. ​a) Calculate the total cost for order sizes of​ 25, 40,​ 50, 60, and 100 ​(round your responses to two decimal​places). ​b) What is the economic order​ quantity?