show step by step process ( especially for question 1 ) of how answer is found so I can learn from your response

thank you

Platinum's estimated that they will require 12,000 wardrobes over the next year. Administrative and other costs associated with placing an order are estimated to be $13 per order. Platinum uses a rate of 15% per year for calculating inventory holding costs. Platinum encourages customers to order in large quantities by offering a price break on volume. The price per wardrobe depends on the order quantity as follows: Price per Order Size wardrobe 0-399 400 - 749 28 750+ 26 30 a. Determine the optimal order quantity for this item. (Show step by step calculations (eg step 1: step 2: step 3) On average, how many orders will Platinum place per year? If the lead-time is two weeks, what is the reorder point? b. c