Given:
a.) Finn goes to the store and buys a bike for $70.
b.) The store has a sales tax rate of 8%.
To be able to determine the amount that Finn will pay, we will be using the following equation:
![\text{Tax = Price of bike x }\frac{\text{ Tax rate}}{100}](https://img.qammunity.org/2023/formulas/mathematics/high-school/m7ogipfpwqdljtlsxtdi75sjhr052rmkxq.png)
We get,
![\text{Tax = Price of bike x }\frac{\text{ Tax rate}}{100}](https://img.qammunity.org/2023/formulas/mathematics/high-school/m7ogipfpwqdljtlsxtdi75sjhr052rmkxq.png)
![\text{ = \$70 x }(8)/(100)](https://img.qammunity.org/2023/formulas/mathematics/high-school/xaadi6x4seypl8avj0yf2e26anrnau19w9.png)
![\text{ = \$70 x }0.08](https://img.qammunity.org/2023/formulas/mathematics/high-school/bjwxpx6ysa1pygs5idr5d03x7meic6msmh.png)
![\text{= \$5.60}](https://img.qammunity.org/2023/formulas/mathematics/high-school/ez97kwjd3z2q3mw4es8swb0409w4rsx8wb.png)
Therefore, Finn will be paying $5.60 for the sales tax of buying a $70 bike.