Discussion

Explanation:

Consider the solution to first question of this set.

For widgets ≤ 100, no test is required.
For 100 ≥ widgets ≤ 200 test 1 is preferred.
For widgets ≥ 200 test 2 is preferred.

In case of 160 defectives he should use test I as it is cheaper.

Hence, option (a).

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