To calculate the sales tax, you can use the formula:
\[ \text{Sales Tax} = \text{Price} \times \text{Sales Tax Rate} \]
In this case, the price is $30 and the sales tax rate is 6% (which is 0.06 in decimal form).
Now, substituting the values into the formula:
\[ \text{Sales Tax} = 30 \times 0.06 = 1.80 \]
So, the sales tax is $1.80.