Answer
The percentage change in her monthly car insurance bill is +42%, so it is a percent increase.
Work Step by Step
At the beginning, Kari was paying 84.00 dollars a month for car insurance.
After she had an accident, her monthly insurance cost became 119.28 dollars.
To find the percentage change, we use the following formula:
percentage change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100%
The original amount is 84.00, and the new amount is 119.28.
We substitute these values into the formula to obtain:
percentage change = $\frac{119.28\ -\ 84.00}{84.00}$ $\times$ 100%
percentage change = $\frac{35.28}{84.00}$ $\times$ 100%
percentage change = 0.42 $\times$ 100%
percentage change = 42%
