A real estate agent is considering changing her land line 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 $.39 a minute for daytime calls and $.19 a minute for evening calls. Plan B has a charge of $.49 a minute for daytime calls and $.14 a minute for evening calls. Plan C has a flat rate of $75 with 225 minutes of calls allowed per month and a charge of $.36 per minute beyond that, day or evening. Required:
a. Determine the total charge under each plan for this case: 120 minutes of day calls and 40 minutes of evening calls in a month.
b. If the agent will use the service for daytime calls, over what range of call minutes will each plan be optimal?
c. 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?

Costco wholesale corporation operates membership warehouses selling food, appliances, consumer electronics, apparel and other household goods at 471 locations across the u.s. as well as in canada, mexico and puerto rico. as of its fiscal year-end 2005, costco had approximately 21.2 million members. selected fiscal-year information from the company's balance sheets follows. ($ millions). selected balance sheet data 2005 2004 merchandise inventories $4,015 $3,644 deferred membership income (liability) 501 454 (a) during fiscal 2005, costco collected $1,120 cash for membership fees. use the financial statement effectstemplate to record the cash collected for membership fees. (b) in 2005, costco recorded $46,347 million in merchandise costs (that is, cost of goods sold). record thistransaction in the financial statement effects template. (c) determine the value of merchandise that costco purchased during fiscal-year 2005. use the financial statementeffects template to record these merchandise purchases. assume all of costco's purchases are on credit.