M.62 athletic apparel is trying to determine how to manage their stock of t-shirts. for one particular size and color they have an average daily demand of 20 shirts, but it varies by about 3 shirts per day. their lead time for receiving new t-shirts is 4 days. they are striving for a 87% service level. what should be their safety stock for this particular t-shirt? (display your answer to two decimal places.) 30.13 what should be their reorder point for this particular shirt? (display your answer to two decimal places.) 82.60

Areal estate agent is considering changing her cell phone plan. there are three plans to choose from, all of which involve a monthly service charge of $20. plan a has a cost of $.42 a minute for daytime calls and $.17 a minute for evening calls. plan b has a charge of $.52 a minute for daytime calls and $.15 a minute for evening calls. plan c has a flat rate of $80 with 275 minutes of calls allowed per month and a charge of $.38 per minute beyond that, day or evening. a. determine the total charge under each plan for this case: 150 minutes of day calls and 70 minutes of evening calls in a month. (do not round intermediate calculations. round your answer to 2 decimal places. omit the "$" sign in your response.)c. if the agent will use the service for daytime calls, over what range of call minutes will each plan be optimal? (round each answer to the nearest whole number. include the indifference point itself in each answer.)d. suppose that the agent expects both daytime and evening calls. at what point (i. e., percentage of total call minutes used for daytime calls) would she be indifferent between plans a and b?