Difficulty: Easy
Correct Answer: 2500
Explanation:
Introduction / Context:Two near-integer multiplications combined: keep one factor per product near a simple integer and adjust slightly. Option spacing (50–180) permits a straightforward nearest-choice selection after a tight estimate.
Given Data / Assumptions:
Concept / Approach:Compute with rounded integers then account for tiny deviations if options appear close. Here, even the simple rounding lands at the correct choice neighborhood.
Step-by-Step Solution:
Rough P1 ≈ 199 * 12 = 2388 Rough P2 ≈ 16.25 * 7 = 113.75 Sum rough ≈ 2388 + 113.75 ≈ 2501.75 → very close to 2500 Refined exact is about 2501.87; still nearest to 2500Verification / Alternative check:Using 199 * 12.005 ≈ 2388 + 0.995 ≈ 2388.995 and 16.25 * 6.95 ≈ 112.94; sum ≈ 2501.94. Nearest option remains 2500.
Why Other Options Are Wrong:2580, 2550: Too high by ~50–80; 2400 is too low by ~100; thus 2500 is best.
Common Pitfalls:Rounding both products upward can bias the sum toward 2550; balance rounding or include a small correction.
Final Answer:2500
Discussion & Comments