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

To calculate the total amount of a bill after adding tax, you can follow these steps:

1. **Identify the original bill amount**: Let's call this amount $ B $.
2. **Determine the tax rate**: Express the tax rate as a decimal. For example, if the tax rate is 7%, you would use $ 0.07 $.
3. **Calculate the tax amount**: Multiply the original bill amount by the tax rate to find the tax amount. 
   \[
   \text{Tax Amount} = B \times \text{Tax Rate}
   \]
4. **Add the tax to the original bill**: Add the tax amount to the original bill amount to get the total.
   \[
   \text{Total Amount} = B + \text{Tax Amount}
   \]
   Or you can combine these into a single step:
   \[
   \text{Total Amount} = B \times (1 + \text{Tax Rate})
   \]

### Example:
If the original bill is $100 and the tax rate is 7%:

1. Original bill amount: $ B = 100 $
2. Tax rate: 7% or $ 0.07 $
3. Tax amount: $ 100 \times 0.07 = 7 $
4. Total amount: $ 100 + 7 = 107 $

So, the total amount would be $107.

Would you like any further details on this process? Here are some related questions you might find interesting:

1. How do you calculate the tax amount if only the total bill is known?
2. What happens if the tax is already included in the bill?
3. How can you find the original bill amount if you only know the total and the tax rate?
4. How do different tax rates affect the total bill amount?
5. How can you calculate the total bill for multiple items with different tax rates?

**Tip:** Always double-check the tax rate being applied, as it can vary depending on the region or type of purchase.

Learn how to calculate the total amount of a bill after adding tax with a detailed step-by-step guide. This problem covers arithmetic and percentage calculations, including the tax calculation formula. Suitable for students in Grades 6-8.

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