To find out how much the car's value decreases per month, we can use division of rational numbers. The total decrease in value is $2,500 over a period of 6 months.
We divide the total decrease by the number of months:
\[ \text{Decrease per month} = \frac{\text{Total Decrease}}{\text{Number of Months}} = \frac{2500}{6} \]
Now we perform the division:
\[ 2500 \div 6 \approx 416.6667 \]
Rounding to the nearest hundredth, we get:
\[ 416.67 \]
Therefore, the value of the car decreases by approximately $416.67 per month.