This question-specific review guide is tied to the answer reasoning for a PracticeTestVault item. Use it after you answer the question so the review stays focused on what the prompt actually tested.
What this question is testing
Objective: Estimation and approximation
Prompt focus: A shopper buys items priced at $4.95, $9.89, and $14.99. Which is the best estimate of the total cost?
Why the correct answer works
$30
Correct. Rounding the prices to 5, 10, and 15 gives an estimated total of 30 dollars.
Why the tempting wrong answer fails
The tempting wrong answer usually loses because it skips the key condition, priority, or evidence in the prompt.
Plain-language takeaway
Round each price to the nearest dollar: 4.95 to 5, 9.89 to 10, and 14.99 to 15. Adding 5, 10, and 15 gives an estimated total of 30 dollars.
Simple analogy
Think of estimation and approximation like following a short checklist: identify the clue, confirm the rule, and then make the move that fits this exact scenario.
How to review it before a retake
- Underline the command word and name what the question is asking before rereading the choices.
- Compare the correct answer against the closest distractor and write the exact detail that separates them.
- Retest this objective with a fresh question without looking at the rationale first.