Final answer:
The correct expression to calculate the amount of sales tax for the computer at store A is option c. 0.06($1,200). To find the amount of sales tax, you need to multiply the price of the computer ($1,200) by the sales tax rate (0.06). The amount of sales tax would be $72.
Step-by-step explanation:
The correct expression to calculate the amount of sales tax for the computer at store A is option c. 0.06($1,200).
To find the amount of sales tax, you need to multiply the price of the computer ($1,200) by the sales tax rate (0.06).
0.06 x $1,200 = $72.