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Answer:
n = 0.0025
Explanation:
400g —————> 1kg
Then
400g —————> 1000g
or 1000/400 = 2.5 ⇔ 400 × 2.5 = 1000
1g ———————> 2.5 × 1 = 2.5g = 0.0025kg
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