Question

$105.79 and sales tax is 9%, wants to leave a 20% tip based on the pretax amount how much would the total be

Answer 1

To calculate the total, we will follow these steps:

1. **Calculate the sales tax** on the pretax amount.
2. **Calculate the tip** based on the pretax amount.
3. **Add the pretax amount, sales tax, and tip** together to find the total.

### Step 1: Calculate the sales tax

The pretax amount is \$105.79, and the sales tax is 9%.

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

\[
\text{Sales Tax} = 105.79 \times 0.09 = 9.4781 \approx 9.48 \text{ (rounded to two decimal places)}
\]

### Step 2: Calculate the tip

The tip is 20% of the pretax amount.

\[
\text{Tip} = \text{Pretax Amount} \times \left(\frac{20}{100}\right)
\]

\[
\text{Tip} = 105.79 \times 0.20 = 21.158 \approx 21.16 \text{ (rounded to two decimal places)}
\]

### Step 3: Calculate the total

Now we add the pretax amount, sales tax, and tip together.

\[
\text{Total} = \text{Pretax Amount} + \text{Sales Tax} + \text{Tip}
\]

\[
\text{Total} = 105.79 + 9.48 + 21.16 = 136.43
\]

### Final Result

The total amount is **\$136.43**.