Answer
Decrease; $16.\overline{6}\%$
Work Step by Step
It is a decrease because 500, the end amount, is less than 600, the original amount.
The percent change is the amount of change (the absolute value difference between the new amount and the original amount) divided by the original amount.
$\frac{|500-600|}{600}$
We use the order of operations to solve:
First, simplify above the fraction bar with subtraction: $\frac{100}{600}$
Next, we divide: $0.1\overline{6}$
To convert to a percent, we multiply by $100$: $16.\overline{6}\%$
