#### Answer

The percentage change in the number of parking spaces is 32%.
Because the percent of change is a positive number, it is a percent increase.

#### Work Step by Step

The number of parking spaces changed from 8400 spaces to 11088 spaces.
To find the percentage change, we use the following formula:
percentage change= $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100%
The number of parking spaces was 8400, and the ending number of spaces became 11088. Substitute these values into the formula:
percentage change = $\frac{11088\ -\ 8400}{8400}$ $\times$ 100%
percentage change = $\frac{2688}{8400}$ $\times$ 100%
percentage change = 0.32 $\times$ 100%
percentage change = 32%
The percentage change in the number of parking spaces is 32%.
Because the percentage change is a positive number, it is a percent increase.