medium · GMAT Quant

A factory produced 18,420 units in Year 1 with an estimated defect rate of 2.8%, and 23,150 units in Year 2 with an estimated defect rate of 4.1%. Using the approximation that unit counts should be rounded to the nearest 1,000 and defect rates to the nearest whole percent, estimate how many more defective units occurred in Year 2 than in Year 1.

1. 400
2. 420
3. 380
4. 340
5. 360

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