Understanding Sales Tax Calculation

The video tutorial explains how to calculate the total cost of a dress including sales tax. It starts with a problem statement about a dress costing $30 with a 9% sales tax. The instructor demonstrates how to calculate the tax by converting the percentage to a decimal and multiplying it by the dress price, resulting in a tax of $2.70. The total cost is then calculated by adding the tax to the original price, giving a final amount of $32.70. The instructor also addresses a previous mistake in the calculation, emphasizing the importance of adding the tax to the original price.

What is the initial cost of the dress that Wilma bought?

• $25

• $30

• $35

• $40

What percentage of the dress cost is the sales tax?

• 5%

• 7%

• 11%

• 9%

How do you express 9% as a decimal for calculation purposes?

• 0.09

• 0.9

• 0.009

• 9.0

What is the calculated sales tax amount on the dress?

• $2.50

• $3.00

• $3.20

• $2.70

What is the total amount Wilma pays for the dress including tax?

• $30.00

• $33.00

• $31.50

• $32.70

What mistake was corrected in the final calculation?

• Using the wrong tax percentage

• Subtracting instead of adding

• Multiplying instead of dividing

• Forgetting to include the dress cost