A contractor needs to dispose of 15 cubic yards of asbestos-containing materials. What is the estimated disposal cost at $85 per cubic yard plus $200 transportation fee?
Correct Answer
A) $1,475
Total cost = (15 cubic yards × $85) + $200 = $1,275 + $200 = $1,475
Why This Is the Correct Answer
The correct calculation is: (15 cubic yards × $85/cubic yard) + $200 transportation = $1,275 + $200 = $1,475. This straightforward two-step arithmetic problem tests the candidate's ability to apply unit pricing plus a fixed fee.
Why the Other Options Are Wrong
Option B: $1,575
$1,575 results from adding an extra $100 to the correct answer of $1,475, or from computing (15 × $85) + $300 instead of $200. This is an arithmetic error in the transportation fee component.
Option C: $1,275
$1,275 represents only the per-unit cost (15 × $85) without adding the $200 transportation fee. This is the most common partial-calculation error — forgetting to include the fixed fee.
Option D: $1,375
$1,375 is not reachable with the given numbers. It may result from computing 15 × $78 + $200 or some other misapplication of the rate, indicating an error in the per-unit calculation.
Memory Technique
Break cost problems into two buckets: Variable + Fixed. Here: Variable = 15 × $85 = $1,275. Fixed = $200. Total = $1,475. Always scan the problem for both a rate and a flat fee before calculating.
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