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We are asked to find the sales tax rate given that the sales tax for an item was \$21.70 and the cost before tax was \$310.

To calculate the sales tax rate, we use the formula:

\[
\text{Sales Tax Rate} = \left( \frac{\text{Sales Tax}}{\text{Cost Before Tax}} \right) \times 100
\]

Substituting the given values:

\[
\text{Sales Tax Rate} = \left( \frac{21.70}{310} \right) \times 100
\]

First, let's calculate the division:

\[
\frac{21.70}{310} \approx 0.07
\]

Now, multiply by 100 to convert it to a percentage:

\[
0.07 \times 100 = 7\%
\]

Thus, the sales tax rate is **7%**.

Would you like further details on this solution or have any questions?

Here are some related questions to expand your understanding:
1. How would the sales tax rate change if the sales tax were \$30 instead of \$21.70?
2. What would the total cost of the item be, including tax?
3. How do you calculate the sales tax if you know the sales tax rate and the price before tax?
4. What is the formula for calculating the price after tax is added?
5. How does changing the price before tax affect the sales tax amount?

**Tip:** Always double-check your calculations, especially when converting between decimals and percentages!

The sales tax for an item was $21.70 and it cost $310 before tax. Find the sales tax rate. Write your answer as a percentage.

Learn how to calculate the sales tax rate for an item that costs $310 before tax with a sales tax of $21.70. Follow this simple step-by-step method using basic arithmetic and percentage calculations. Suitable for students in Grades 6-8.

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