Answer
The percent change in his rent is +34%, so it is a percent increase.
Work Step by Step
At the beginning, Caleb pays 400 dollars.
After a roommate leaves, Caleb will pay 536 dollars.
To find the percentage change in his rent, we use the following formula:
Percent change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100%
The original amount is 400, and the new one is 536. We substitute these values into the formula to obtain:
Percentage change = $\frac{536\ -\ 400}{400}$ $\times$ 100%
Percentage change = $\frac{136}{400}$ $\times$ 100%
Percentage change = 0.34 $\times$ 100%
Percentage change = 34%
