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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:

Vase: $5.50

tax: 6.25%

The tax is 6.25% 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:

$\begin{array}{l}x=6.25\%\text{ofCost+Cost}\\ x=6.25\%脳\$5.50+\$5.50\\ x=\frac{6.25}{100}脳5.50+5.50\\ x=0.0625脳5.50+5.50\\ x=0.3437+5.50\\ x=\$5.8437\end{array}$

Thus, the total cost of a vase is $5.8437.