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The percent change is the increase or decrease in the value of a quantity. If the new value is larger than the original value then it is a percent increase and if the change in value is lesser than the original value it is called percentage decrease.

Sales tax is a tax that is added to the price of the item the final price is called selling price. It is a percent of the increase in the cost.

We are given the following price and the tax percentages:

Pillow: $9.99

tax: 6.75%

The tax is 6.75% of the price. We will add this amount to the original price.

So, If x represents the new price after adding taxes then we have:

$\begin{array}{l}x=6.75\%\text{ofCost+Cost}\\ x=6.75\%脳\$9.99+\$9.99\\ x=\frac{6.75}{100}脳9.99+9.99\\ x=0.0675脳9.99+9.99\\ x=0.6743+9.99\\ x=\$10.6643\end{array}$

Thus, the total cost of a pillow is $10.6643.