total amount of bill by adding the tax to the bill.

To calculate the total amount of a bill by adding tax, you can use the formula:

\[
\text{Total Amount} = \text{Original Bill Amount} + (\text{Original Bill Amount} \times \text{Tax Rate})
\]

Alternatively, this formula can also be written as:

\[
\text{Total Amount} = \text{Original Bill Amount} \times (1 + \text{Tax Rate})
\]

**Here’s a step-by-step process:**

1. **Determine the Original Bill Amount:** This is the amount before tax.
2. **Determine the Tax Rate:** This is the percentage of the original bill that is added as tax.
3. **Calculate the Tax Amount:** Multiply the original bill amount by the tax rate.
4. **Calculate the Total Amount:** Add the tax amount to the original bill amount.

### Example Calculation

Suppose the original bill amount is $100, and the tax rate is 7%.

1. **Original Bill Amount:** $100
2. **Tax Rate:** 7% (or 0.07 as a decimal)
3. **Tax Amount:** $100 \times 0.07 = 7$
4. **Total Amount:** $100 + 7 = 107$

So, the total amount of the bill including tax is **$107**.

Would you like more details or have any specific questions?

### Related Questions:

1. How do you convert a percentage to a decimal when calculating tax?
2. What if there are multiple taxes applied to the bill? How do you calculate the total?
3. How can you calculate the total amount if the tax rate is given in a different format?
4. How does rounding affect the total amount when calculating tax?
5. Can you show an example with a different original bill amount and tax rate?

**Tip:** When working with percentages, always convert them to decimals by dividing by 100 before performing calculations.

Learn how to calculate the total amount of a bill by adding tax using a step-by-step guide. Includes examples with different original bill amounts and tax rates. Suitable for students in Grades 5-8.

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