To find the tax on the sports radio, we have to find the 7% of 45.75 like this:
[tex]\begin{gathered} 7\text{ \% = 0.07} \\ \Rightarrow45.75\cdot0.07=3.2025 \end{gathered}[/tex]This means that the 7% tax on the radio is $3.20 dollars
Now we have to add that to the price to get the total:
[tex]45.75+3.20=48.95[/tex]Therefore, the total price of the sports radio is $48.95