Final answer:
The total cost of Mackenzie's meal in Burlington, after including a 15% sales tax and a 20% tip on the original $20 cost, comes to $27.
Step-by-step explanation:
To calculate the total cost of Mackenzie's meal including the sales tax and tip, we need to perform a two-step calculation. First, we calculate the sales tax by converting the percentage to a decimal (15% becomes 0.15) and multiplying it by the meal cost:
Sales tax = 0.15 × $20 = $3
Next, we calculate the tip based on the pre-tax amount of the meal. Again, converting the percentage to a decimal (20% becomes 0.20):
Tip = 0.20 × $20 = $4
Now, we add both the sales tax and the tip to the original cost of the meal to determine the total cost:
Total cost = original cost + sales tax + tip
Total cost = $20 + $3 + $4 = $27
Therefore, the correct answer is b. $27.