Answer: B. 5%
The discount for a price is computed using the following formula:
[tex]\text{ sale price }=\text{ original price}(1-\text{ percent off})[/tex]From the given, we know that:
Sale price = $237.50
Original price = $250.00
Substitute these to the formula then solve for the percent off:
[tex]\begin{gathered} 237.50=250.00(1-\text{percent off}) \\ \frac{237.50}{250.00}=1-\text{ percent off } \\ \text{ percent off }=1-\frac{237.50}{250.00} \\ \text{ percent off }=0.05\times100=5\% \end{gathered}[/tex]Therefore, the discount rate was 5%.