To calculate the percent markdown of the car's price, you can use the following ratio:
\[ \frac{\text{Original Price} - \text{Current Price}}{\text{Original Price}} \]
In this case, the original price of the car is $28,500 and the current price is $25,875. The markdown amount is:
\[ \text{Original Price} - \text{Current Price} = 28,500 - 25,875 = 2,625 \]
Now, substituting the values into the ratio:
\[ \frac{2,625}{28,500} \]
So the ratio that can be used to calculate the percent markdown is:
\[ \frac{2,625}{28,500} \]
This fraction can then be converted into a percentage by multiplying by 100.