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Best way to get the solution without actually doing a calculation would be considering that for every 6512 produced (double given production) there are 32 defectives. Doing some approximation, we get that 36 defectives would be slightly above 6512. Therefore, our answer choice is 7,326.

IMO option C.
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Given:

widgets : defective = 3,256 : 16
36 total defective

Solution:

36 - (16)2 = 36 - 32 = 4

4 / 16 = 1/4

3,256 x 2 = 6,512 + 1/4 (3,256) = 7,326 (C)
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