To calculate the total cost of the lunch including tax and tip, we can follow these steps:
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Calculate the sales tax:
Sales tax is calculated on the pre-tax amount (the cost of the food).
Sales tax = Cost of food × Sales tax rate
Sales tax = $105.79 × 0.09 = $9.4781
Rounding this to two decimal places, we get:
Sales tax ≈ $9.48 -
Calculate the total cost including tax:
Total cost including tax = Cost of food + Sales tax
Total cost including tax = $105.79 + $9.48 = $115.27 -
Calculate the tip based on the pre-tax amount:
Tip = Cost of food × Tip rate
Tip = $105.79 × 0.20 = $21.158
Rounding this to two decimal places, we get:
Tip ≈ $21.16 -
Calculate the final total including tip:
Final total = Total cost including tax + Tip
Final total = $115.27 + $21.16 = $136.43
Therefore, the total amount Jesse will pay, including tax and tip, is $136.43.