Discussion
Which year did the company's permanent workers contribute the minimum percentage of the total annual workhours of the entire workforce ?

Answer: C
The permanent workers' share of workhours was lowest in 2015.
The permanent workers' share is 10P / (10P + 6T), with P and T read from the chart:
\[ \begin{aligned} 2013 &: 3250/4450 \approx 73\% \\ 2014 &: 3500/4550 \approx 77\% \\ 2015 &: 3750/5850 \approx 64\% \\ 2016 &: 4000/5470 \approx 73\% \end{aligned} \]
2015 stands out because it had by far the most temporary workers, about 350, nearly as many as its 375 permanent workers, so the temporary workers' hours took a much larger share that year than in 2013, 2014 or 2016.
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