Keoni is buying a package of air filters for 
\[\$13.60\]. The sales tax rate is 
\[9\%\].
What is Keoni's total, including sales tax, to the nearest cent?

To calculate Keoni's total cost including sales tax, follow these steps:

1. **Sales tax calculation**:
   \[
   \text{Sales tax} = \text{Price} \times \text{Sales tax rate} = 13.60 \times 0.09 = 1.224
   \]
   The sales tax is \$1.224.

2. **Total cost calculation**:
   \[
   \text{Total cost} = \text{Price} + \text{Sales tax} = 13.60 + 1.224 = 14.824
   \]
   Rounding to the nearest cent, Keoni's total cost is:
   \[
   14.82
   \]

So, Keoni's total cost including sales tax is **\$14.82**.

Would you like more details or further explanation?

Here are 5 related questions:
1. How would the total change if the sales tax was 8%?
2. What would the total be if the air filters cost \$20.50?
3. How do you calculate sales tax when multiple items are bought?
4. What is the formula for finding the sales tax percentage if you know the total?
5. What happens if a discount is applied before calculating sales tax?

**Tip**: Always calculate the tax based on the price before any discounts or added fees.

Keoni is buying a package of air filters for $13.60. The sales tax rate is 9%. What is Keoni's total, including sales tax, to the nearest cent?

Find out how to calculate the total cost including a 9% sales tax on a $13.60 purchase. This step-by-step guide explains the key concepts of percentage calculation and rounding, suitable for students in Grades 5-7.

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