CEIE 301 HW 4
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GEORGE MASON UNIVERSITY CEIE 301 – Engineering and Economic models in civil engineering Spring 2024 HOMEWORK # 4 Due on 02/16/2024 (Total Points 30 points) 4.11 The Bureau of Indian Affairs provides various services to American Indians and Alaska Natives. The Director of Indian Health Services is working with chief physicians at some of the 230 clinics nationwide to select the better of two medical X-ray system alternatives to be located at secondary-level clinics. At 5% per year, select the more economical system. Solve using tabulated factors. (5 Points)
X-ray System Del Medical Siemens First cost, $ −250,000 −224,000 Annual operating cost, $/year −231,000 −235,000 Overhaul in year 3, $ — −26,000 Overhaul in year 4, $ −140,000 — Salvage value, $ 50,000 10,000 Expected life, years 6 6 4.12 The Briggs and Stratton Commercial Division designs and manufactures small engines for golf turf maintenance equipment. A robotics-based testing system will ensure that their new signature guarantee program entitled “Always Insta-Start” does indeed work for every engine produced. Compare the two systems at a MARR of 10% per year. Solve using tabulated factors.
(5 Points)
System Pull Push First cost, $ −1,500,000 −2,250,000 Annual M&O cost, $/year −700,000 −600,000 Rebuild cost in year 3, $ 0 −500,000 Salvage value, $ 100,000 50,000 Estimated life, years 8 8 4.14 (5 Points) A company that manufactures and markets integrated systems for analysis of genetic variation and function is considering the mutually exclusive projects shown, all of which can be considered to be viable for only 10 years. If the company’s MARR is 15% per year, determine which should be selected on the basis of a present worth analysis. Financial values are in $1000 units.
Project W X Y Z First cost, $ −1400 −2000 −4200 −6300 Annual net income, $/year 320 510 1000 1300 Salvage value, $ 9 5 7 7 4.49 (5 points) An engineer calculated the PW values for four alternatives to develop a remotely controlled vibrations control system for offshore platform application. The results in the table use a MARR of 14% per year. Determine which alternative(s) should be selected if (
a
) the alternatives are mutually exclusive, and (
b
) if the projects are independent. Alternative I J K L Life, n
, years 3 4 12 6 PW over n years, $ 16.08 31.12 −257.46 140.46 PW over 6 years, $ 26.94 15.78 −653.29 140.46 PW over 12 years, $ 39.21 60.45 −257.46 204.46 4.50 (10 points) The product development group of a high-tech electronics company developed five proposals for new products. The company wants to expand its product offerings, so it will undertake all projects that are economically attractive at the company’s MARR of 20% per year. The cash flows (in $1000 units) associated with each project are estimated. Which projects, if any, should the company accept on the basis of a present worth analysis, under the following conditions? a. There is no budget restriction. b. If the allowed budget is no more than $1.3 million (i.e., $1300 in $1000 units). Project 1 2 3 4 5 Initial investment, $ −400 −510 −660 −820 −900 M&O cost, $/year −100 −140 −280 −315 −450 Revenue, $/year 360 235 400 605 790 Salvage value, $ — 22 — 8 95 Life, years 3 10 5 8 4
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ki2 Question 47 of 50
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5
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