Final answer:
First, calculate sales tax by multiplying the meal cost by the sales tax rate converted to a decimal. Next, calculate the tip by multiplying the pre-tax meal cost by the tip percentage converted to a decimal. Add the original cost, sales tax, and tip together for the total cost.
Step-by-step explanation:
To calculate the total cost including tax and tip for Jesse's purchase from a steakhouse, we first need to calculate the sales tax and then the tip amount. Since the food costs $105.79 and the sales tax rate is 9%, we will convert 9% to a decimal by dividing by 100 (0.09) and multiply by the cost of the meal to get the sales tax:
Sales Tax = 0.09 × $105.79 = $9.52
Now, for a 20% tip based on the pre-tax amount, convert 20% to a decimal (0.20) and again multiply by the cost of the meal:
Tip = 0.20 × $105.79 = $21.16
Next, add the original meal cost, the sales tax, and the tip to find the total:
Total Cost = $105.79 + $9.52 + $21.16 = $136.47
However, the options A to D do not include $136.47. Since the question may contain a typo or error, double-check the calculations, and if they are indeed correct, choose the closest option or clarify the situation with the student.