A machine purchased three years ago for $360,000 has a current book value using straight-line depreciation of $200,000; its operating expenses are $30,000 per year. A replacement machine would cost $240,000, have a useful life of nine years, and would require $13,000 per year in operating expenses. It has an expected salvage value of $65,000 after nine years. The current disposal value of the old machine is $85,000; if it is kept 9 more years, its residual value would be $10,000. Required:
a. Calculate the total costs in keeping the old machine and purchase a new machine.
Old machine New Machine
Total cost :
b. Should the old machine be replaced?
Yes
No

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?