Answer :

Azieq
400 = 14 detective , 1 = 28/4/7 part , 1000 = 2857/3/7 parts
mols
There's two and a half times as many parts, so you would expect there to be two and a half times as many defective parts.

14x2.5=35

So there should be 35 defective parts :)

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