Finding the Tax Amount

A video game costs 60 dollars. The sales tax rate is 8%. How much is the tax?

Identify the values: Price = 60 dollars, Tax rate = 8% = We have our starting values

Convert percent to decimal: $8\% = 8 \div 100 = 0.08$ = Tax rate as decimal: $0.08$

Calculate the tax: $60 \times 0.08 = 4.80$ = Tax amount: 4.80 dollars

Answer: The sales tax is 4.80 dollars

Finding the Total Price

A jacket costs 85 dollars. With 6% sales tax, what is the total price?

Calculate the tax amount: $85 \times 0.06 = 5.10$ = Tax: 5.10 dollars

Add tax to original price: $85 + 5.10 = 90.10$ = Total: 90.10 dollars

Answer: The total price including tax is 90.10 dollars

Using the One-Step Method

A bicycle costs 250 dollars. The tax rate is 7.5%. Find the total price using one calculation.

Convert tax rate to decimal: $7.5\% = 0.075$ = Decimal: $0.075$

Add 1 to get the multiplier: $1 + 0.075 = 1.075$ = Multiplier: $1.075$

Multiply price by multiplier: $250 \times 1.075 = 268.75$ = Total: 268.75 dollars

Answer: The total price is 268.75 dollars. This method gives you the total in one step!

Calculating Tax on Multiple Items

You buy a shirt for 25 dollars, pants for 40 dollars, and shoes for 65 dollars. The tax rate is 8.25%. What is the total cost?

Find the subtotal: $25 + 40 + 65 = 130$ = Subtotal: 130 dollars

Convert tax rate to decimal: $8.25\% = 0.0825$ = Decimal: $0.0825$

Calculate the tax: $130 \times 0.0825 = 10.725$ = Tax: 10.73 dollars (rounded)

Find the total: $130 + 10.73 = 140.73$ = Total: 140.73 dollars

Answer: The total cost including tax is 140.73 dollars

Mistake: Using the percentage directly without converting to a decimal

Why: Multiplying by 8 instead of 0.08 gives a number 100 times too large!

Correct: Always divide the percentage by 100 first: $8\% = 0.08$

Mistake: Forgetting to add the tax to the original price

Why: The tax amount alone is not what you pay - you pay the original price PLUS the tax.

Correct: Total = Price + Tax Amount, or use the one-step method: Price $\times$ (1 + rate)

Mistake: Rounding incorrectly with money

Why: Money should be rounded to the nearest cent (2 decimal places).

Correct: Round 10.725 to 10.73, not 10.7 or 11

Shopping Trip

Before you go shopping, you can calculate approximately how much you'll spend including tax.

If you have 50 dollars to spend and tax is 6%, your maximum purchase is about 47 dollars (because 47 + tax ≈ 50).

Restaurant Bills

When dining out, tax is added to your food total before you calculate the tip.

A meal costs 35 dollars. With 7% tax, the taxed total is 37.45 dollars. Then you add tip on top of that.

Q: Why do different places have different tax rates?

A: Sales tax is set by governments (state, province, or country). Each region decides its own rate based on how much revenue it needs for public services like schools and roads.

Q: Is tax always added to everything?

A: Not always! In many places, groceries, medicine, and clothing for children are tax-free or have lower rates. It depends on local laws.

Q: Why do we use the multiplier 1.08 instead of 0.08?

A: When you multiply by 0.08, you get ONLY the tax. When you multiply by 1.08, you get the original price (1) PLUS the tax (0.08) in one step. It is faster!