PR 2
Ekonomi Teknik Instruksi :
- Jawaban ditulis tangan dan dikumpulkan melalui bit.ly/PR2EKTEK selambat-lambatnya padaSelasa, 28 September 2021 pukul 18.00.
Format penamaan file : NIM_Nama_PR2.pdf
- Diperbolehkan menggunakan bantuan spreadsheet dengan tetap mencantumkan alur pengerjaan yang dapat dipahami pada lembar jawaban.
- Penilaian tidak hanya dilihat dari nilai jawaban akhir, tetapi juga pada proses pengerjaan dan ketepatan penulisancash flow.
Selamat mengerjakan!
1. Quinton’s refrigerator has just died. He can get a basic refrigerator or a more efficient refrigerator with an Energy Star designation. Quinton earns 4% compounded annually on his investments, he wants to consider a 10-year planning horizon, and he will use present worth analysis to determine the best alternative. What is your recommendation?
Basic unit Energy star unit
Initial cost 700 800
Delivery and installation 60 60
Professional servicing (year 5) 100 100
Annual energy costs 120 55
Salvage value (year 10) 150 175
2. A building contractor obtained bids for some asphalt paving, based on a specification.
Three paving subcontractors quoted the following prices and terms of payment:
Paving Co. Price Payment Schedule
Quick $85,000 50% payable immediately
25% payable in 6 months
25% payable at the end of one year
Tartan $82,000 Payable immediately
Faultless $84,000 25% payable immediately 75% payable in 6 months
The building contractor uses a 12% nominal interest rate, compounded monthly, in this type of bid analysis. Which paving subcontractor should be awarded the paving job?
3. A city has developed a plan to provide for future municipal water needs. The plan proposes an aqueduct that passes through 500 feet of tunnel in a nearby mountain. Two alternatives are being considered. The first proposes to build a full-capacity tunnel now for $556,000. The second proposes to build a half-capacity tunnel now (cost = $402,000), which should be adequate for 20 years, and then to build a second parallel half-capacity tunnel. The maintenance cost of the tunnel lining for the full-capacity tunnel is $40,000 every 10 years, and for each half-capacity tunnel it is $32,000 every 10 years.
The friction losses in the half-capacity tunnel will be greater than if the full-capacity tunnel were built. The estimated additional pumping costs in the single half-capacity tunnel will be $2000 per year, and for the two half-capacity tunnels it will be $4000 per year. Based on capitalized cost and a 7% interest rate, which alternative should be selected?
4. A cost analysis is to be made to determine what, if anything, should be done in a situation offering three “do-something” and one “do-nothing” alternatives. Estimates of the cost and benefits are as follows
Alternative Cost Uniform Annual Benefit
End-of Useful-Life Salvage Value
Useful Life (years)
1 $500 $135 $0 5
2 $600 $100 $250 5
3 $700 $100 $180 10
4 $0 $0 $0 0
Use a 10-year analysis period for the four mutually exclusive alternatives. At the end of 5 years, Alternatives 1 and 2 may be replaced with identical alternatives (with the same cost, benefits, salvage value, and useful life).
a. If an 8% interest rate is used, which alternative should be selected?
b. If a 12% interest rate is used, which alternative should be selected?