Chapter 6 - Percent - 6.3 Using the Percent Proportion and Identifying the Components in a Percent Problem - 6.3 Exercises - Page 409: 51

$50\%$, or half, of the students work part time.

We are told that out of 8600 students, 4300 work part time. We can find out the percentage that this corresponds to by dividing: $\frac{4300}{8600}=\frac{43}{86}=0.5=50\%$ Thus $50\%$, or half, of the students work part time.