The ratio that can be used to calculate the percent markdown is the difference in price over the original price. Specifically, the fraction representing this ratio is:
\[ \frac{\text{Original Price} - \text{Current Price}}{\text{Original Price}} = \frac{28,500 - 25,875}{28,500} \]
Calculating the difference:
\[ 28,500 - 25,875 = 2,625 \]
So the ratio can be expressed as:
\[ \frac{2,625}{28,500} \]
This fraction can be used to calculate the percent markdown.