Final answer:
To calculate the sales tax, multiply the taxable amount of the sale by the sales tax percentage. In this case, the amount of the sales tax is $9.94.
Step-by-step explanation:
To calculate the sales tax, multiply the taxable amount of the sale by the sales tax percentage. In this case, the taxable amount is $142 and the sales tax percentage is 7%. So, the amount of the sales tax is:
142 x 0.07 = $9.94
Therefore, the amount of the sales tax is $9.94.