Question 9 • Q5 Geometry New 2022
The label covers the cylinder’s lateral area, which is 2πrh. Using r = 1.5 inches and h = 2.5 inches gives 2π(1.5)(2.5) = 7.5π ≈ 23.55 square inches per label (using π ≈ 3.14). At $0.02 per square inch, each label costs about 23.55 × $0.02 = $0.471. For 150,000 labels, the total is about $0.471 × 150,000 = $70,650, so the answer is $70,650.
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