You pulled 20 samples of rejected bolts from Batch A, B and C (above) (60 samples in total) so you could examine them yourself under low power magnification. 10 samples from the 20 Batch A rejects, and 4 samples from 20 Batch B rejects, and 12 samples from the 20 Batch C rejects had a common problem. That problem was treads that had metal burrs on them. What percentage of the total production of 10,000 bolts likely had metal burrs on the treads?