To calculate the total amount Jesse needs to pay, we'll follow these steps:
- Calculate the sales tax.
- Calculate the tip based on the pre-tax amount.
- Add the pre-tax amount, sales tax, and tip together to find the total.
Step 1: Calculate the sales tax.
- The food costs: $105.79
- Sales tax rate: 9%
Sales Tax = Cost × Sales Tax Rate
Sales Tax = $105.79 × 0.09 = $9.4781 (approximately $9.48 when rounded to two decimal places)
Step 2: Calculate the tip based on the pre-tax amount.
- The pre-tax amount is $105.79.
- Tip rate: 20%
Tip = Pre-Tax Cost × Tip Rate
Tip = $105.79 × 0.20 = $21.158 (approximately $21.16 when rounded to two decimal places)
Step 3: Calculate the total amount.
Total = Pre-Tax Cost + Sales Tax + Tip
Total = $105.79 + $9.48 + $21.16
Total = $136.43
Therefore, the total amount including tax and tip is $136.43.