[tex]\begin{gathered} \text{Cost}=1200 \\ \text{Sales tax=5\% (that is 0.05 x 1200)} \\ \text{Sales tax=60} \\ \text{Total cost=Cost + Sales tax} \\ \text{Total cost = 1200 + 60} \\ \text{Total cost = 1260} \end{gathered}[/tex]
The total cost of a $1200 computer with a 5% sales tax is $1,260
