solve these problems

The initial cost of a bridge that is expected to be in place forever is $70 million. Maintenance can be done at I-, 2-, 3-, or 4-year intervals, but the longer the interval between servicing, the higher the cost. The costs of servicing are estimated at $83,000, $91,000, $125 000, and $183,000 for intervals of i through 4 years, respectively. What interval should be scheduled for maintenance to minimize the overall equivalent annual cost? The interest rate is 8%% per year. A construction company bought a 180,000 metric ton earth sifter at a cost of $65,000. The company expects to keep the equipment a maximum of 7 years. The operating cost is expected to follow the series described by 40,000 + mojoout, where & is the number of years since it was purchased (t = 1, 2, . . . . 7). The salvage value is estimated to be $30,000 for years I and 2 and $20 000 for years 3 through 7. At an interest rate of 10%% per year, deter- mine the economic service life and the associated equivalent annual cost of the sifter.A crashing machine that is a basic component of a metal recycling operation is wearing out faster than expected. The machine was purchased 2 years ago for $400,000. At that time, the buyer thought the machine would serve its needs for at least 5 years, at which time the machine would be sold to a smaller independent recycler for $30,000. Now, however, the company thinks the market value of the diminished machine is only $50,000. If it is kept, the machine's operating cost will be $37,000 per year for the next 2 years, after which it will be scrapped for $1000. If it is kept for only 1 year, the market value is estimated to be $10,000. Altema- tively, the company can of nice the process now for a fixed cost of $56,000 per year. At an interest rate of 10%% per year, should the company continue with the current machine or o arce the process? The data associated with operating and maintain- ing an asset are shown below. The company man- ager has already decided to keep the machine for I more year (ie., until the end of year 1), but you have been asked to determine the cost of keeping it more year after that. At an interest rate of 10% ber year, estimate the AW of keeping the machine from year I to year 2. Operating Cost. Year Market Value, $ $ per Year 30,000 -15,000 25,000 -15,000 14,000 -15,000 10,000 -15,000A machine that cost $120,000 three years ago can be sold now for $34,000. Its market value for the next 2 years is expected to be $40,000 and $20,000 one year and 2 years from now, respectively. Its operating cost was $18,000 for the first 3 years of its life, but the M&( cost is expected to be $23,000 for the next 2 years. A new improved ma- chine that can be purchased for $138,000 will have an economic life of 5 years, an operating cost of $9000 per year, and a salvage value of $32,000 after 5 years. At an interest rate of 10% per year, determine if the presently owned ma- chine should be replaced now, I year from now, or 2 years from now. The projected market value and MA( costs asso- ciated with a presently owned machine are shown (next page). An outside vendor of services has of- fered to provide the service of the existing ma- chine at a fixed price per year. If the presently owned machine is replaced now, the cost of the fixed-price contract will be $33,000 for each of the next 3 years. If the presently owned machine isKeep or Replace the Kiln Case PE In Example 1 1.8, the in-place kiln and replacement killm (GH) were evaluated using a fixed study pe- riod of & years. This is a significantly shortened period compared to the expected 12-year life of the challenger. Use the best estimates available throughout this case to determine the impact on the capital recovery amount for the GH kiln of short- ening the evaluation time from 12 to 6 years. Nabisco Bakers currently employs staff to operate the equipment used to sterilize much of the mixing, baking, and packaging facilities in a large cookie and cracker manufacturing plant in lowa. The plant manager, who is dedicated to cutting costs but not sacrificing quality and hygiene, has the projected data shown in the table below if the current system were retained for up to its maximum expected life of 3 years. A contract company has proposed a turnkey sanitation system for $5 0 million per year if Nabisco signs on for 4 to 10 years, and $5.$ mil- ion per year for a shorter number of years. Retained AM, $ per Year Close.Down Expense, $ -3,000,000 -2,300,000 -2 500,000 -2,300,000 -2 000,000 -3,000,000 -1,000 00D -3,000,000 -1,000,000 -3 5001000 -500,000 (4) At a MARR = 8% per year, perform a re- placement study for the plant manager with fixed study period of 3 years, when it is an- ticipated that the plant will be shut down due to the age of the facility and projected tech- nological obsolescence. As you perform the study, take into account that regardless of the number of years that the current sanitation system is retained, a one-time close-downIn 2008, Amphenol Industrial purchased a new quality inspection system for $530,000. The esti- mated salvage value was $30,000 after 8 years. Currently the expected remaining life is 3 years with an AOC of $27,000 per year and an estimated salvage value of $30,000. The new president has recommended early replacement of the system with one that costs $400,000 and has a 5-year economic service life, a $45,000 salvage value, and an estimated AOC of $50,000 per year. If the MARR for the corporation is 12% per year, find the minimum trade-in value now necessary to make the president's re economically advantageous A CNC milling machine purchased by Proto Tool and Die 10 years ago for $75,000 can be used for } more years. Estimates are an annual operating cost of $63,000 and a salvage value of $25,000. A chal- longer will cost $130,000 with an economic life of 6 years and an operating cost of $32,000 per year Its salvage value will be $45,000. On the basis ofWe continue with the progressive example of possibly replacing a kiln at B&T Enterprises. A marketing study revealed that the improving business activity on the west coast implies that the revenue profile between the installed kiln (PT) and the proposed new one (GH) would be the same, with the new kiln possibly bringing in new revenue within the next couple of years. The president of B&T decided it was time to do a replacement study. Assume you are the lead engineer and that you previously completed the ESL analysis on the challenger (Exam- ple 11 3) It indicates that for the GH system the ESL is its expected useful life. Challenger: ESLA = 12 years with total equivalent annual cost AW= $-12.32 million The president asked you to complete the replacement study, stipulating that, due to the rapidly rising annual operating costs (AOC), the defender would be retained a maximum of 6 years. You are expected to make the necessary estimates for the defender (PT) and perform the study at a 15%% per year retum.\f