Two traffic signal systems are being considered for an intersection. One system costs $31,000 for installation and has an efficiency rating of 80%, requires 26 kW power (output), incurs a user cost of $0.23 per vehicle, and has a life of 9 years. A second system costs $47,000 to install, has an efficiency rating of 87%, requires 34 kW power (output), has a user cost of $0.19 per vehicle, and has a life of 17 years. Annual maintenance costs are $75 and $95, respectively. MARR = 8% per year. How many vehicles must use the intersection to justify the second system when electricity costs $0.09/kWh? Assume salvage value for each system equals zero. Project the difference in the user cost as savings for the second system. There are approximately 8,760 hours/year. Click the icon to view the interest and annuity table for discrete compounding when the MARR is 8% per year. At least 108000 vehicles per day must use the intersection to justify the second system. (Round up to the nearest whole number.)

ENGR.ECONOMIC ANALYSIS
14th Edition
ISBN:9780190931919
Author:NEWNAN
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Chapter1: Making Economics Decisions
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Two traffic signal systems are being considered for an
intersection. One system costs $31,000 for installation and has an
efficiency rating of 80%, requires 26 kW power (output), incurs a
user cost of $0.23 per vehicle, and has a life of 9 years. A second
system costs $47,000 to install, has an efficiency rating of 87%,
requires 34 kW power (output), has a user cost of $0.19 per
vehicle, and has a life of 17 years. Annual maintenance costs are
$75 and $95, respectively. MARR = 8% per year. How many
vehicles must use the intersection to justify the second system
when electricity costs $0.09/kWh? Assume salvage value for each
system equals zero. Project the difference in the user cost as
savings for the second system. There are approximately 8,760
hours/year.
Click the icon to view the interest and annuity table for
discrete compounding when the MARR is 8% per year.
At least 108000 vehicles per day must use the intersection to
justify the second system. (Round up to the nearest whole
number.)
Transcribed Image Text:Two traffic signal systems are being considered for an intersection. One system costs $31,000 for installation and has an efficiency rating of 80%, requires 26 kW power (output), incurs a user cost of $0.23 per vehicle, and has a life of 9 years. A second system costs $47,000 to install, has an efficiency rating of 87%, requires 34 kW power (output), has a user cost of $0.19 per vehicle, and has a life of 17 years. Annual maintenance costs are $75 and $95, respectively. MARR = 8% per year. How many vehicles must use the intersection to justify the second system when electricity costs $0.09/kWh? Assume salvage value for each system equals zero. Project the difference in the user cost as savings for the second system. There are approximately 8,760 hours/year. Click the icon to view the interest and annuity table for discrete compounding when the MARR is 8% per year. At least 108000 vehicles per day must use the intersection to justify the second system. (Round up to the nearest whole number.)
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