Tim urban, owner/manager of urban's motor court in key west, is considering outsourcing the daily room cleanup for his motel to duffy's maid service. tim rents an average of 50 rooms for each of 365 nights (365 × 50 equals the total rooms rented for the year). tim's cost to clean a room is $ 12.50. the duffy's maid service quote is $ 18.50 per room plus a fixed cost of $ 25 comma 000 for sundry items such as uniforms with the motel's name. tim's annual fixed cost for space, equipment, and supplies is $ 60 comma 000.

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?