To calculate the sales tax, you can use the formula:
\[ \text{Sales Tax} = \text{Purchase Price} \times \text{Sales Tax Rate} \]
In this case, the purchase price is $925 and the sales tax rate is 7%, or 0.07 in decimal form.
\[ \text{Sales Tax} = 925 \times 0.07 = 64.75 \]
Lucy will pay $64.75 in sales tax.