To calculate the sales tax, you can use the following formula:
\[ \text{Sales Tax} = \text{Price} \times \text{Sales Tax Rate} \]
In this case, the price of the snowblower is $349.99, and the sales tax rate is 7.5% (or 0.075 in decimal form).
Now, plug in the values:
\[ \text{Sales Tax} = 349.99 \times 0.075 \]
Calculating that gives:
\[ \text{Sales Tax} = 26.2475 \]
Rounding to the nearest hundredth, the sales tax Sally will have to pay is:
\[ \text{Sales Tax} \approx 26.25 \]
So, Sally will have to pay $26.25 in sales tax.