The ratio that can be used to calculate the percent markdown is represented as the difference between the original price and the current price over the original price.
The markdown amount is:
\[ \text{Markdown} = \text{Original Price} - \text{Current Price} = 28,500 - 25,875 = 2,625 \]
Thus, the ratio can be expressed as:
\[ \frac{\text{Markdown}}{\text{Original Price}} = \frac{2,625}{28,500} \]
So, the ratio you can use to calculate the percent markdown is:
\[ \frac{2625}{28500} \]