A LEED project requires that 20% of construction materials be sourced within 500 miles of the project site. The total material cost is $850,000. What is the minimum dollar value of materials that must be sourced locally?
Correct Answer
B) $170,000
20% of $850,000 = 0.20 × $850,000 = $170,000. This calculation determines the minimum dollar value of locally sourced materials required for the LEED credit.
Why This Is the Correct Answer
The correct answer is B) $170,000 because this is a straightforward percentage calculation. To find 20% of the total material cost, we multiply $850,000 by 0.20 (which is 20% in decimal form). This gives us $170,000, which represents the minimum dollar value of materials that must be sourced within 500 miles of the project site to meet the LEED requirement.
Why the Other Options Are Wrong
Option A: $150,000
Option A ($150,000) is incorrect because it represents approximately 17.6% of the total material cost, which falls short of the required 20% threshold for the LEED credit.
Option C: $185,000
Option C ($185,000) is incorrect because it represents approximately 21.8% of the total material cost, which exceeds the minimum requirement and would result in unnecessary additional costs.
Option D: $200,000
Option D ($200,000) is incorrect because it represents approximately 23.5% of the total material cost, significantly exceeding the 20% minimum requirement.
Memory Technique
Remember 'Twenty percent = Two-tenths = 0.20' - always move the decimal point two places to the left when converting percentages to decimals for multiplication.
Reference Hint
Look up LEED certification requirements and sustainable construction practices in the Green Building and Environmental sections of your contractor reference materials.
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