[tex]\begin{gathered} TST=IC\times ST \\ \text{Where:} \\ \text{TST}=\text{ Total sales tax}=30.6 \\ IC=\text{Item cost}=340 \\ ST=\text{Sales tax rate} \\ \text{Therefore:} \\ ST=\frac{TST}{IC} \\ ST=\frac{30.6}{340} \\ ST=0.09 \end{gathered}[/tex]
Answer:
0.09 or 9%
